Message SAP WXP509 - Your supply source determination cannot be used for MAP allocation tables

Diagnosis
You want to create an allocation table in manual planning. In doing so,you must choose an allocation table type &V1& with item category &V2&.You have entered value &V3& as the supply source for this itemcategory. These values cannot, however, be used for generatingallocation tables in Merchandise and Assortment Planning.

System Response
You cannot use this allocation table type or item category to create anallocationt type in manual planning.

Procedure
Change the supply source determination for item category &V2&.