Transit Procedure for Freight Units 
You use this process to make the required entries and settings related to opening the transit procedure for a freight unit in a forwarding order. This process can be used, for example, if you need to add a package to a truck at the last minute. In this case, you open the transit procedure in the freight unit before you assign the freight unit to the relevant freight document. However, you still close the transit procedure from the freight document (see Transit Procedure: Close Transit in Freight Documents).
Note
For the transit procedure, SAP TM does not provide functions for integrating a customs management application. You can make the required entries and settings that relate to the transit procedure in the relevant business documents, but you cannot trigger any follow-on processes in a connected customs management application. If required, however, you can implement a Business Add-In (BAdI) in order to call an outbound service for a transit declaration. For more information, see Customizing for Transportation Management under 
Business Add-Ins (BAdIs) for Transportation Management 
Basic Functions Global Trade Declarations BAdI: Creation of Transit Declarations on Freight Document 
.
Note that the following is an example of the transit procedure for freight units. Variants of this process are possible.
Prerequisites
You have defined a customs activity for opening the transit procedure and you have assigned the customs activity to a customs profile. You have assigned the customs profile to the relevant freight unit types.
You make these settings in Customizing for Transportation Management as follows:
You define activities and profiles under
Basic Functions Global Trade Define Customs Activities and Profiles .You can use standard customs activity TRA_T1_FU for opening the transit procedure in freight units. This activity is assigned to standard customs profile GT_INBOUND_FU.
Note that you also have to define customs statuses and cumulated customs statuses. You assign the customs statuses to the customs activity. You can also assign block reasons to cumulated customs statuses.
For more information, see Configuration of Customs Processing.
You assign the customs profile to the freight unit types under
Planning Freight Unit Define Freight Unit Types .
You have defined that customs handling is automatic in the relevant forwarding order types. You define forwarding order types in Customizing for Transportation Management under
Forwarding Order Management Forwarding Order Define Forwarding Order Types .The goods have arrived at the point of entry into the customs union.
Process
You create a forwarding order with the required items.
When you save the forwarding order, the system generates freight units.
On the Customs tab page at item level in the forwarding order, you enter the required customs data (for example, commodity code and previous documents) and you set the inbound customs activity to Transit Procedure.
On the Stages tab page in the forwarding order, you set the inbound customs activity to Transit Procedure for the first stage of the actual route.
You save the forwarding order.
On the Customs tab page at item level, the inbound customs activity is automatically set to Transit Procedure.
At item level in the forwarding order, you select the items that have been flagged as relevant for the transit procedure and you choose the Open Transit pushbutton.
The system does the following:
Checks whether a customs profile is assigned to the freight unit type (for example, standard customs profile GT_INBOUND_FU)
Determines which customs activities are assigned to the customs profile (for example, standard customs activity TRA_T1_FU)
Runs the customs relevance check that is assigned to the customs activity (for example, standard customs relevance check TRA_T1_FU)
Creates customs groups according to the grouping strategy assigned to the customs activity (for example, standard grouping strategy TRA_OPENFU).
For more information about the standard grouping strategies, see Customs Groups.
You save the forwarding order.
You open the freight unit.
In the freight unit, the system displays the customs activity in the Customs Activity group box on the Customs tab page. The system selects the Customs Relevance checkbox for the customs activity.
You display the customs groups by selecting the customs activity in the Customs Activity group box. The system displays the customs groups in the Item Groups table. You can display the items assigned to each customs group by selecting the customs group and choosing the Show Assigned Items pushbutton.
The customs status of each customs groups is displayed in the Status field in the Item Groups table. At this point, the customs groups have the customs status for requesting the opening of the transit procedure, as defined in the customs activity (for example, “Open Transit Requested”).
At header level in the freight unit (that is, on the Statuses tab page and at the top of the Customs tab page), the system displays the relevant cumulated customs status. The system also displays the cumulated customs status at header level in the forwarding order (on the Statuses tab page) and at item level (on the Customs tab page for the item).
If you have assigned a block reason to the cumulated customs status, the system sets an execution block in the freight unit and the forwarding order.
You inform the customs authorities that you want to open the transit procedure for the customs groups (for example, by using a non-integrated customs management application).
You cannot transport the goods to the transit end location until the customs authorities have approved the transit procedure.
In the freight unit, you manually change the customs status of the customs group to the relevant status (for example, “Open Transit Approved”).
You enter the information provided by the customs authorities for the customs group:
Customs management document number
This is the unique document number that the customs management system assigns to a customs procedure that you have triggered.
Customs reference number
In the European Union, for example, this is the movement reference number (MRN).
Expiration date
This is the date by which the transit procedure must be completed.
The system transfers the customs reference number, customs management document number, and expiration date to the items in the forwarding order (displayed on the Customs tab page at item level).
Based on the customs status of each customs group, the system sets the relevant cumulated customs status at header level in the freight unit (that is, at the top of the Customs tab page). It also sets the cumulated customs status in the forwarding order at header level (Status tab page) and item level (Customs tab page for the item). If you have not assigned a block reason to the cumulated status, the system resets any existing execution blocks.
Result
After opening the transit procedure, you must assign the freight unit to the relevant freight document. This enables you to close the transit procedure in the freight document.