
There could be dozens of various reasons to trigger FPRUNX errors during adobe form generation like 'ADS: com. adobe.ProcessingException: com.adobe.Processing'. Find below discussions about the basic FPRUNX Error messages and possible solutions:
Maybe can try the below method as one quick option by setting a breakpoint at routine 'create_output_current_form' of program LFPCOMPFRM and monitoring the result at 'LX_ERROR'.

Then check the detailed error message inside ERRMSGSHORT:

Ps: Debug tips for ERS form (Invoice verification of Evaluated Receipt Settlement)
- Retrigger TCODE: MR90
- Log check TCODE: MIR4

After completing this blog I find out I already mentioned this break-point
here by myself. Need to improve my skills in Keyword &Tag selection and memory as well~