I have been struggling with this issue for a while and have not got any response, so I’m resorting to paid support if there is any.
Everytime I file a POS closure, it throws me that same error. I’ve tried multitude of things to no avail. AFAIK, on closing, a Sales Invoice should be generated automatically, because the error specifically points to “Sales Invoice” and not “POS Invoice” according to the Naming Series projected.
I’m in dire need of help and I really hope someone can sort this out once and for all for me.