OIC Integration fills the "First-Party Tax Registration Number" field in paybles even though the fie

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Hello

I have an integration in OIC that creates an invoice in AP, but when creating this invoice, the "First-Party Tax Registration Number" field is filled even if nothing is sent!

I would like to know the logic behind this field in AP to be automatically filled via the integration in OIC.

Because the information that is being filled in the "First-Party Tax Registration Number" by the integration is wrong, so I would like to know if there is a way to manipulate what the integration in OIC will automatically fill even when the field is sent blank?