Implications of multiple External IDs for EDIINT

What are the implications of setting up two separate External IDs for our Enterprise Profile in regards to EDIINT?

We plan to use EDIINT AS2 transportation mechanisms for multiple customers. Our current customer uses an External ID type of ABAAS2 for out profile. Another customer wants to use another identifier of 13 digits as our AS2 profile. We can successfully setup the two separate external ID’s, but we are concerned that both identifiers will continue to work. There is a further possibility of adding other identifiers to meet customer requirements.

We are currently on TN 6.1

After some investigation it appears that AS2 EDIINT document type is able to resolve any set up External ID type.