At least one repair center is required for each Biomed Make/Model record. The Repair Centers for Make/Model types also act as a filter, so you can see only Make/Model records that are associated with the Repair Centers you have access to.
When you save a Biomed Make/Model record, the combination of the following must be unique; otherwise, WebTMA pops up a warning message. Be sure the following (in combination) are unique: