When you save the company file on a server to let multiple users access it simultaneously, you must keep the QB on the server running in multi-user mode and all other systems connected to it in single-user mode. When this perfect setting is not implemented, you get QuickBooks Error 6000 103 while accessing the company file. There are some other causes too that can trigger the same error in QuickBooks, and to know more about them and their solutions, follow this article until the end.