Delete HL7 Standard Schema

Hi,

I am trying to delete a HL7 standard schema i created by mistake however when i select delete in Studio i get the following:

The xml is as below:

<?xml version="1.0"?> <Category name="WYT.2.4" std="1">...

i then remove the std so it becomes:

<?xml version="1.0"?> <Category name="WYT.2.4">...

Then i get the error:

I have also tried exporting and importing the schema with the std part removed but still get an error.

We have IRIS 2020.1.

Any ideas?

Thanks,

Graham