Hi Elizabeth They might have changed the editable property to "No" for the "contact" field in the customer card . You should also check the variable "ContactEditable" in CAL Code if its fetching the value true or false. If its a test database you can change it to true and edit, But its not recommended to change any properties or code in the production environment unless you are authorized to do it.
Thank you! Out of interest I had tried disabling the automatic creation by removing the entry for the Contact No. Series but that didn't work. I didn't think to try removing the Bus. Relation Code for Customers field. I can see that could be a useful option for some as the whole Relationship Management structure can be a little overwhelming. You do then lose, or at least significantly restrict all the RM functionality though, yes? And you can not then have multiple contacts (directly, at least) for any Customer.