Sage 500

We are receiving "error during updates" when posting workorders of more than 100 items. My hunch is that this is due to other database activity or locks on the system. Has anyone else experienced this behavior? (We are on Sage 500 2014).

We have a system batch with several hundred pending invoices tied to it. What should be done with these invoices to get them posted or cleaned up? And what causes them to be kicked into the system batch? Thanks for any help.