Create Approval Procedure in GRPO for Specific Item Group

I need to create an approval procedure in GRPO if  the    OITB.[ItmsGrpNam]  ='PVC Resin' .I've created an approval procedure using the following query and created an approval template using this .But it is not working .Please help me someone to archive this .

SELECT T0.[DocNum], T1.[Dscription], T1.[ItemCode], T2.[ItmsGrpNam] FROM OPDN T0

INNER JOIN PDN1 T1 ON T0.DocEntry = T1.DocEntry, OITB T2 WHERE T2.[ItmsGrpNam]  ='PVC Resin'

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