Merge Over Multiple Schema

Procedure A and Table A are located in Schema A. Procedure A performs a merge between View B of Schema B and Table A. Procedure A is giving a ORA-00942(table or view does not exist) for the following line ... USING (SELECT * FROM B.VIEWB) D

Code excerpt
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MERGE INTO A.TableA C
USING (SELECT * FROM B.ViewB) D
ON (C.dealerid = D.di_dealer_id)
WHEN MATCHED THEN UPDATE SET

C.dealername = D.di_dealer_name,
C.dealerno = D.di_dealer_no,
C.fedid = D.di_fed_id,
C.oldate = D.di_online_dte, ...

Permissions given are as follows

Schema A
----------------
ProcedureA - execute on User A
TableA- Insert, Delete, Update, Select on User A

Schema B
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ViewB - Select on User A, Select on UserARole

I believe appropriate permissions have been given.