[Bug]: "Swiss QR-Bill Incoming Doc" UpdatePurchDocFromIncDoc Override Purchase Fields with empty Values from QRCode

[PeterDurrer]

Describe the issue

If you scan a Swiss Qr Code for a purchase, with empty optional values ??????not filled in the QRCode, these will clear the purchase header values.

Expected behavior

If you scan a Swiss Qr Code for a purchase, with empty optional values ??????not filled in the QRCode, don't override the purchase header values.

Steps to reproduce

Open a new Purchase Invoice
Fill the Vendor and Check or Fill the Fields:
"Posting Description"
"Payment Reference"
"Vendor Invoice No."
"Document Date"

Scan the QR Code (With empty "QR-Bill Unstr. Message","QR-Bill Reference No.","Billing Information")

Check the Fields:
"Posting Description" --> actual Empty, expected not changed
"Payment Reference" --> actual Empty, expected not changed
"Vendor Invoice No." --> actual Empty, expected not changed
"Document Date" --> actual Empty, expected not changed

Additional context

No response

I will provide a fix for a bug

• I will provide a fix for a bug
  Internal work item: AB#568198

[JesperSchulz]

@altotovi, could you triage this one?

[JesperSchulz]

@PeterDurrer, we're unable to triage your issue at the moment. As it is a regulatory requirement, we need specific people to give the "go ahead", but they are currently unavailable. We'll have to get back to you on this one a bit later. Thank you for your patience.

[JesperSchulz]

Luckily I was able to find someone to look into your issue, and it got approved 😊 Please continue your PR!