Defining Reason Codes for Interaction Records

To be able to assign a reason code when creating an interaction record, you must first define the reason code in Customizing.

Check the subject profile used for interaction record.
On the SAP Easy Access screen for Customer Relationship Management, choose Transactions Basic Settings Define Transaction Types and select Interaction Record (standard IR type 0010) activity reason as subject profile; the subject profile is defined under the Customizing Header folder.
Use subject profile for interaction record.

On the SAP Easy Access screen, for Customer Relationship Management, choose Transactions Settings for Activities Define Activity Reasons Define Subject Profiles . Select Activity Reason as the subject profile (ACT000001) used for interaction records and then select Code Groups from the navigation panel on the left; the Catalog and CodeGrpProfile fields for the subject profile Activity Reason (ACT000001) are A1 and A0000001 respectively.
Define reason codes for activity reasons.

On the SAP Easy Access screen, for Customer Relationship Management, choose Transactions Settings for Activities Define Activity Reasons Define Code Group Profiles .