Transfer Posting for SC

Hello friends,

When trying to post subcontracting stock to Vendor using MB1B I am getting the error <b>Please Enter a Valid Activity Code</b> can anybody help me what I should do ?

Error Messege- <b>Please Enter a Valid Activity Code

Message no. 26000</b>

Thanks and Regards,

Chetan.

Message was edited by:

Chetan Sukdeo Bodade