Invoice Source- Lookup Code "Invoice Gateway" has meaning of Spreadsheet

Summary: Invoice Source- Lookup Code "Invoice Gateway" has meaning of Spreadsheet as part of seeded configuration. So, when client searched in Manage Invoice work area with source as Spreadsheet, they find invoices with source as Invoice Gateway. Is there a way Lookup code name can be changed to Spreadsheet as client wants this to be in sync. They do not want to change the meaning as Spreadsheet source makes more sense to them.

Is this editable ? Any help is much appreciated.

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