Sage CRM 2022 R1 Custom Entity - Saving a document logs user out of CRM

I used the Sage CRM 2022 Advanced Customization wizard to create a new main entity.
When trying to add a document to the entity the user is logged out on clicking the save button and a strange URL appears in the logon screen - ..CRM/eware.dll/<meta%20name=
I have replicated this on a CRM instance with sample data.
Any ideas on where to look?

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