PERM Approved(Error in PERM), Applying for I140

[XYXY]

I got my PERM approval few days ago and I am ready to apply for I140. But the approved PERM has a mistake, the attorney has put the Number of hours worked as a Graduate Assistant in the University as 40hrs per week. where as it was only 20 hrs per week. 

Can anyone let me know, will be this be a problem in I140 application OR is there anyway to correct this mistake without re-applying for PERM??

any suggestions/help is appreciated.