Collection Letters for Multi Org Arrears

We have advanced collections, using collection strategies. We have multiple operating units and we don't have any individual configuration at OU level. We work at account level.

If we have an account which has delinquencies for more than one OU, should I expect a letter issued for each OU or should I expect one letter to be issued?

The reason for asking is that customers are receiving a letter for each OU, and this is what the business wants, however, when you look at the letter and xml data from the correspondence tab you only see the details for one letter. When checking the associated concurrent request I can only see the details for one letter, yet when I check the printer logs I can see a multi page print.