1. That's a special case for Cash payment rule not related to the button.
2. Seems weird - it's also showing the amount negative and creating the
payment with the invoice amt positive
Also the button keeps enabled after the invoice is paid and allows me to
change things but apparently it does nothing.
Another test - I created the invoice, made a partial payment and then
the button opened the window but didn't work at all, so, it seems if
there are partial payments it does nothing.
Agree showing that field is misleading.
3. Didn't understand the test case.
Regards,
Carlos Ruiz
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