Using PFCG transaction, you will have to maintain authorization data via "Authorizations" tab for concerned single role.
Then, on screen authorization, add your transaction code to authorization field TCD, which depends on authorization object S_TCODE (Transaction Code Check at Transaction Start) from object class AAAB (Cross-application Authorization Objects).
After modifications, generate your single role.
If purchasing documents can be processed in this transaction, you will have to give also authorization to process those documents.
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