When you edit the X12 agreement in the Azure Portal blade for Integration Account, you see under the receive and send settings a picker for the ISA12 field aka Control Version Number. But what about the Group Header field GS08 aka Version Release Identifier?
You can control this with the agreement property groupHeaderVersion in the envelope settings. While not in the user interface at the moment, you can edit this field under “Edit as JSON”
"envelopeSettings": {
"controlStandardsId": 85,
"useControlStandardsIdAsRepetitionCharacter": false,
"senderApplicationId": "11111",
"receiverApplicationId": "22222",
"controlVersionNumber": "00401",
"interchangeControlNumberLowerBound": 1,
"interchangeControlNumberUpperBound": 999999999,
"rolloverInterchangeControlNumber": true,
"enableDefaultGroupHeaders": true,
"groupControlNumberLowerBound": 1,
"groupControlNumberUpperBound": 999999999,
"rolloverGroupControlNumber": true,
"groupHeaderAgencyCode": "T",
"groupHeaderVersion": "004010",
"transactionSetControlNumberLowerBound": 1,
"transactionSetControlNumberUpperBound": 999999999,
"rolloverTransactionSetControlNumber": true,
"overwriteExistingTransactionSetControlNumber": true,
"groupHeaderDateFormat": "CCYYMMDD",
"groupHeaderTimeFormat": "HHMM",
"usageIndicator": "Information"
},