You may check below values in AMS and ISF, to make sure the value are match between AMS and ISF filling
AMS
- Issuer SCAC Code
- BL Number
- BL indicator
ISF
- AMS BL Type
- AMS BL Number(this contains AMS Issuer SCAC Code and BL Number)
#1, answered 2025-12-10 by Koko