CA Easytrieve Report Generator, release 11.6.
EVF9 is an abend generated by the virtual file manager (ETVFMP, ETVDSMP, ETVBMP) and it means: "Leading and trailing record lengths are not equal".
This was found to be a problem with the data in this case. The lines of data in error were deleted and the problem resolved.
If this had been a problem with the amount of data, the recommendation would have been to use PARM WORKFILE(YES) in order to use report work files instead of the VFM files.