PI Sheet Error - Unable to create message (After upgrade from 701 to 702)

Hi SAP Gurus,

We have upgraded SAP from 701 to 702 release and since then we are getting an error in some of our web based PI sheet (CO60). We get this error message when we executing the digital signature to receive the production (MIGO with 101 movement type). Please see more details about the error.

Unable to create message

Message no. CB1206

Diagnosis

An error occurred while the message characteristics were being processed. The message was not created in the R/3 System.

Procedure

Use the system messages written for the message characteristics to analyse and correct the error.

Any ideas what is causing this ?

Thank you.