Since it is unmodified standard code you can only get a solution from the source: SAP
So you would need to search SAP Marketplace and if nothing found you have to open a call yourself.
You have luck twice, that somebody else had already made this call at SAP, and that I search for you. I only entered LI04 into the search field and my first hit was: 2194781 - Storage Unit number truncated in LI04 print - WM