Currently the financial dimension is disabled on purchaser order header when the purchaser order is partially invoiced. Customer requests the purchase order header' financial dimension could be updated when purchase order is partially invoiced, customer could click no button to not update the purchase order line financial dimension.

Customer business scenario:

Currently purchase orders created from purchase requisitions do not put dimensions on the header - this is standard functionality. Any orders from MRP do not put dimensions on the header - also standard functionality.

When customer need to modify one of these purchase orders. Eg to change pricing or add freight. The user clicks on PO > Request change and edits the order. If there have not been any invoices, then they can add the financial dimension: department on the PO header and put it through workflow. no problem. 

If there has been a partial invoice and customer need to edit the PO in order to process the final invoice, then they can't edit the department on the header. The financial dimension is not editable when purchase orders are partially invoiced. for customer use the info from financial department to find proper approve in their workflow, If they try to submit to workflow then it fails because it can't find an approver without the department. They are stuck! 

Currently they have to modify the workflow every time to allow that particular PO number to auto approve. This is NOT a long-term solution.