XML Message fails when it begins with a comment

We have a VAN provider that sometimes sends files that have a comment right after the XML Declaration.

• When we receive such messages, Link fails to process them.

• If we manually remove the comment and process the files, Link processes them corretly.

According to XML Specification, after the XML Declaration it is possible to have such comments. See first example here: https://www.tutorialspoint.com/xml/xml_comments.htm

I have tried to attach a sample file but the platform here did not allow it, so here's a sample of how the message begins:

<?xml version="1.0" encoding="utf-8"?>

<!--Buum5-->

<E-Document>