3061148 - Change source of supply is grayed out in Stock Transfer Proposal for a Business User

When trying to access option Change Source of Supply for a Stock Transfer Proposal ID KLM (KLM means Stock Transfer Proposal ID), the option Change Source of Supply is disabled from Business User ID DEF (DEF means user ID).

SAP Business ByDesign

Change Source of Supply is grayed out in Stock Transfer Proposal for a Business User, SCM_PROCESSPRODNPRPSLS (Process Production Proposals) and SCM_PROCESSPURCHASEPRPSLS, Change Source of supply is disabled,  "Change source of supply" is disabled from your Business User , KBA , change source of supply is grayed out , stock transfer proposal , grayed out , "change source of supply" is disabled , AP-SDM , Supply and Demand Matching , Problem