Invoice Approval Workflow - Business Unit with "+" Character

Hi

I have question regarding invoice workflow spreadsheet. There is "+" character in BU name and I need to use BU name in my invoice approval criteria. the BU name is "A+B Corporate". Spreadsheet can be uploaded successfully, however the invoice approval workflow is ended in error and can't be routed. and when I checked the log from transaction console, I saw the the BU name is become "A" + "B Corporate".

Could someone please advise how to make this BU name can be recognized correctly ("A + B Corporate", instead of "A" + "B Corporate") when spreadsheet is uploaded? I have tried to put double quote or single quote in excel spreadsheet for the Bu name, but it doesn't work