Thanks Deepak, I hadn't found that thread in my searching. Will try contacting the owner to see if they got it resolved.
I have used the EFM for our localisation files as I am familiar with the requirements, but the NACHA ones have a huge number of fields & I am struggling to work out what the data requirements are, as I am not US based and haven't used the US banking system.
The cost to my customer for my time would be huge