I just encountered this error for the first time (sadly, it was after I spent 20 minutes manually formatting a handlebar laden JSON chunk)
The maximum size of the field: rest.body.0 in the Import document should be 10240 bytes.
Why? Quick google scans only come up with some WorkManager/Android related limitations on 10240 bytes.
Luckily, I was able to satisfy this input validation by removing whitespace form the template, though at the great cost of readability. What if the API I was calling (huge, international 3PL) was just a little longer? I couldn't use integrator because of a field size limit?
Maybe there is a solid reason for this limit that I'm not understanding or seeing, if not I hope Celigo will lift this restriction ASAP so we can avoid an integration catastrophe! /hyperbole
Seriously.... please remove the limit.