Vendor & customer same person

[Colin]

Hi,

I have a vendor for whom I occasionally perform some tasks. However usually
I owe him for the services he provides.

I would like to simply reduce the accounts payable for his account and see
the outstanding amount when I have performed a task, but at the moment,
Gnucash separates the vendor accounts and customer accounts and also doesn't
allow the posting of a negative amount in a bill, so how do I handle that
situation?

regards,
Colin.

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