Hi 
I want to map a field between lead and opportunity for converted lead. But I get the following error 
Error: Lead field length of 3,900 is greater than this field's length of 255
I cant change the data type of the of the opportunity field since it is associated with one workflow and formula field
then what are the other ways to resolve it ??

Please Note : I have migrated these changesets from sandbox to production(in dev it worked fine but production creates a problem)

Critical issue