how many lines can i have on a PO?

There is no hard limit and depends on what Chrome can handle. We tell users not to go past 150 lines. Once the browser chokes then the transaction cannot be saved and all work is lost.

sure, that is what I figured, what about item receipt? same/

I thought there is a 10,000 line limit on any transaction sublist?

Yes but the hangup is in the browser and not in NS: it just freezes when the transaction has too many lines.

I believe 10,000 is the absolute limit (for scripts). You definitely lag way before that in UI as Tim mentioned.

That depends on your tier I suppose. I've seen 10,000 line transactions in the UI 🙂