i couldnt use feature "Procure Goods from Preferred Sources During Catalog Shopping"

Summary:

i enabled this feature "Procure Goods from Preferred Sources During Catalog Shopping" also i grant my self privilege "POR_ALLOW_SHOPPING_FROM_ALL_SOURCES_PRIV" but still can choose source type "Inventory / Supplier" when select items from catalog but i can select only the source in "Enter Requisition Line"

Note :

-We didn't enable RSSP yet currently we are using Standard SSP

-My Expectation after enabling this feature and grant my self privilege is to can see option to select source while adding items from catalog , please correct me if am wrong.

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