This query will be received if a non teaching Post has been assigned with a role of TAS (Teaching Assistant) or HLTA (Higher Level Teaching Assistant) - if the role is TAS or HLTA the post would usually be listed as Teaching Assistant.
However if this is the case this is a query so can be annotated for the reason when uploading your census. Alternatively, to amend the contract please go to Admin > Personnel > Staff - find the staff member. Click onto the black cog next to any contracts in scope - amend the role or post and update at the bottom.