Update problem with financial fields

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Yes, I tested it in MySQL. It does not return an error but it also doesn't return results where there definitely are records for this contact.

But I found a little more:

My invoices contain a custom field (cf_832) which is a relation to a second person. This is sometimes needed, sometimes not. When I am in the contacts module und looking for invoices related to this contact it should show the records related to their contactid. Strangely enough the system seems to use the custom field as identifier to retrieve the related invoices. As a result
1. no invoices get displayed when there is no second contact related to the invoice, and
2. when looking at the secondary contact those invoices are displayed that should be displayed for the primary one.

Do you have any hint how this could be switched?

PS: The invoices are stored with the correct contactid.