what is the source for CATEGORY for description based items requisition in TAB rules

Summary:

we are currently using a mappign set with "Item Category " as source for deriving charge account.

This does not work for description based lines. what is the source to use which directly takes the category from the req line and not from item purchasing category? this way, the source will work for both description based items as well as item number based items assigned to purchasing category.

Tried this below source that had CATEGORY in the name, however it did not work .

standard error related to this source does not apply for charge account

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