Actualy S0C7 abends normaly happens due to wrong data/ non-
numeric data in numeric field.By wrong data i mean to say 
like if key is duplicated or some garbage data.

      The resolution can be done in two ways :
1)code fix by which you can fix the cobol program code and 
stage it
2)By deleting the bad records from the file 

But be carefull about the file deletion if its a batch 
process and some other  jobs depend on the p[articular 
job,so it can effect to other if any wron fixation done.