Requirement Filter 
You can use the requirement filter rule to exclude sales orders and stock transport orders (STO) that have (previously) been selected for ARun. In this way you can, for example, prevent orders from credit blocked customers from being assigned stock that you want to use for solvent customers.
Prerequisites
You must define a requirement filter rule in Customizing under 
Logistics - General 
SAP Fashion Management Order Allocation Run (ARun) Online ARun Selection Maintain Rules to Filter Requirements 
. You can define your own rules for requirement filtering to perform checks on the selected records based on the defined rules for requirement selection.
Features
After you have decided which requirements the order allocation run should access (for example, which sales orders and STOs should be allocated), you can check these requirements for the following criteria:
Header Credit Check: Performs credit check at order header (applicable to sales orders only).
Cancel Date: Checks the cancellation date at order item level (applicable to sales orders only). You can specify the number of days before the order cancel date until when the order must be allocated in the Days field.
Season Check: The system checks that all items within an order are assigned a valid season (applicable to sales orders and STOs).
Depending on the outcome of these checks, the orders can then be excluded from the order allocation run. You can define what action the system takes after the checks are executed by selecting one of the following options:
Information (I): The system displays an information message and the requirements are considered for allocation.
Error (E): The requirements are excluded from the allocation.
Warning (W): The system displays a warning and the requirements are considered for allocation.
X (No Action): The system ignores the field check and all requirements are included for allocation.
You can combine the above-mentioned checks in a checking rule in Customizing. The result of failed checks can be saved in a log file.