Hi,

I've got that issue too.  It does not appear with a new database, but only with a previously created database. This is probably due to a change in the workflow XML that does is not updated in existing databases.

To fix the issue:

• go to Settings -> Technical -> Workflows -> Transitions
• advanced search "Trigger expression = procurement_lines_get()"
• Delete the transition
• upgrade the "sale" module, that will recreate the transition with the correct parameters.

After that, confirming sale orders should work again.

Regards,

Jos