This is the formula I am building to populate the Opportunity Name field in Process Builder
Here Product_Type__c is a Picklist field
[Task].Account.Name  +  '-' + TEXT([Task].Product_Type__c )
Error:
The formula expression is invalid: Field Task is a picklist field. Picklist fields are only supported in certain functions
 
                        
I had the correct Syntax. Not sure why i got that error. I do see the string coorectly concatenated.