Send one tracking number of the many tracking numbers sent by 3PL to EDI ASN

Our 3PL, Synapse, can generate multiple tracking numbers per sales order. On import of pick confirmation, we save the many tracking numbers into the tracking number field. This is then sent on the ASN, which would cause an invalid ASN because it hits a character limit.

We request that, if possible, we only send one (1) of the many tracking numbers, separated by commas, to Costco's ASN so that it will not fail.