BR-KSA-F-12

The Other Seller/Buyer schema ID (BT-29-1 or BT-46-1) contains spaces. Please recheck the attribute and remove the empty space to avoid non-compliance.

warning: reported, still valid

What the rule checks

As the rule set's publisher wrote it. The rule runs on every element the context matches, and fails where the test is false; the validator reports the line of that element.

Test
$scheme-raw and $scheme-up = $allowed-here and $scheme-raw != $scheme-trim

Checked with Saudi Arabia ZATCA Tax Invoice (UBL), Saudi Arabia ZATCA Simplified Tax Invoice (UBL)