Error when we are trying to add the item to the shopping cart

Dears,

Have a good day,

Please your kind support to help me in solving the following problem:

The employee wants to submit an internal requisition to withdraw items from the warehouse using the responsibility "iProcurement" ... when he selected the source of the item and clicked to add it to the cart ... the following error appeared:

You cannot add internally sourced line to this requisition since the requisition has already been processed by Order Management.

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Taking into your consideration that this error appears only at this user and doesn't appear in anyone else's account.

Please check the attached image.

Waiting your kind help.