Exclude 0 amount tax boxes from tax box allocation (e.g. cancelled tax lines or invoices) and xml ou

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Hi everyone,

I am finishing implementation of JPK (Polish SAFT file) in our instance. Allocations and rules work perfectly with one exception.
We should not report 0 value tax boxes through the output xml file.
Case is when invoice or tax line is cancelled tax box allocation still grabs it and final XML generating process shows tax boxes with 0 amount.
Even entirely cancelled invoices are displayed with tax boxes (K_ codes) of 0.00 value (see screenshot).

Am I missing some obvious tax box allocation rule/system configurations?

Documentation I reviewed to configure what I have and/or find the solution so far: