I have 2 objects, i created a approval process on 2nd object my requirement is on approval i need to update a field in first object,
Please let me know is it possible or not.
In the approval process on Object 2, in the final approval step
Foo. The action can then update the parent Object1.
You have to use Process Builder as Worklfow (except in rare cases like Case Comment->Case) can't update related records
I believe that you need to have a master-detail relationship for a child to update fields on a parent object with a field-update workflow rule. Cross-Object Field Updates
You could come up with a work around where you set a field on the child object, and then use a trigger to set that value on the parent.