I've just installed 6.0.2 on Ubuntu 11.04 with both GTK client and Web client. I would prefer the later, as I'm quite used to web-based applications. So I'm basically talking about web client, though actually not the so-called "Openerp-web" itself but just the Openerp in my Firefox.

I just fiddled with buttons and links, to get a better idea of the whole thing. I did not add any new records into the sample database. I got a problem here.

Very often, when I tried to delete some records, like order, sale..., I was warned of this or that. I just followed the hint, though it did not hint much, at least for me. I got even more confused of the "criteria" of a record to be deleted.

1. An "approved" order can not be deleted. So I had to cancel it. Is this right? I have to delete all "pickings" of a order. what does this mean? Anyway, I just cancel one planned shipment. Is this right?
2. When I try to delete an "request for quotation". "A document was modified since you last viewed it (Purchase Order:1)" What does this mean? I'm totally stuck here. It is the same situation for all 3 "RFQ"s in sample database.

However, just now, just out of curiosity, I tried in GTK client. Any record can be deleted with one click of button!! What's the difference? I'd expected that "Openerp-web" and Gtk client do exactly the same thing for me.

(BTW, if there is any document regarding this out there, please let me know.)

Well. seems my questions are too stupid for you to answer. Perhaps I should have put it as "how to find more detailed explanation to warning messages?"

Anyway, I dropped the original database and created a new one without demo data. Now it's easier for me.

A document was modified since you last viewed it (Purchase Order:xxx).
This error occurred when you try to delete a purchase order that is waiting for confirmation, you need to cancel it before.

Yann.Papouin, Thanks for your answer, it was helpful to me.
Regards.