Unable to Update the SQL Queries in Data Model in bi publisher 11g

Hi Team,

We are using BI Publisher 11.1.1.7.1 version.we have 5 data sets in one data model for a report and we need to update the existing queries .we are trying to pull from data marts instead of tables.we are getting error "Failed to load XML DATA" .when we execute each data set individually, it is working fine and we are getting XML but when we keep all data sets in one data model , we getting error. 10G version is working is fine.In 10G when we just paste the updated queries it is working but in 11g it is failing.is there any