Credit memo tax line is lost when referenced to an invoice

Summary:

Hi all,

We have invoices with total amount without tax (NO VAT), we need to import credit memos having tax and referenced them to the invoices. We are trying to import via AutoInvoice Import process, the credit memo with a tax classification code and tax amount, but system is not considering this and its taking only the tax on referenced invoice which is 0. Hence, we are ending with lost credit memo tax line and tax amount + the tax classification code remains on the credit memo line.

However, when importing On account Credit memo with a tax line (no info related to Reference Interface Line Context and DFFs are provided in the fbdi) and then apply it to an invoice, that doesn't have tax, through "Manage Credit Memo Applications", the system is accepting tax line.