Transaction Code Errors on Bank Statement Load

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We are loading are bank statements into Oracle and we have the BAI Codes setup under transaction codes and a parse rule set. When we load our bank statements we are receiving the following errors

The transaction code 177 couldn't be found (I don't think this is a valid code or at least it doesn't show up in the BAI documentation).

The tranaction code NCHG couldn't be found. Along with NCHK, NCOM, NDDT, NINT, NMSC and NTAX. Would anyone know what the codes starting with N mean? I was able to find NMSC when I queried on the internet, but I don't have enough information to set them up in Oracle, To load them I need the code, a description and transaction type.