'RelatedTableRole' conflicts with another 'RelatedTableRole' on relation MainAccount_Offset on table Jobmaster.

Hi all 

i want to create a relationship from mainaccount table for 2 different fields,

for eg,

i want to assign the main account id to ledgeraccount

and want to assign the main account id to offsetaccount

to achieve this , i created 2 relations but i got error msg as 

'RelatedTableRole' conflicts with another 'RelatedTableRole' on relation MainAccount_Offset on table Jobmaster.

suggestions pls