G.T.R. Data Inc.
Partner – ISA Information
This screen  defines the ISA or outer envelope. The Partners EDI ID is the send address of the partner. The qualifiers tell us what the ID is. In our example ZZ means mutually defined between the partners.
The user ID is the sender on the ISA envelope. The security for send and receive is also defined on this screen with their qualifiers. The test/prod switch allows for a test environment between you and your partner.