BO Report tabs abnormal behavior

Hi Team

My project system environment is SAP BW 7.3 and BO 4.1

1)We have defined a BO WebI report with two tabs(Tab1- Detail data,Tab2-Column chart) on top of Bex query using BICS connection,which is running fine and loading data in DEV Environment

2)This report is promoted to QA using Promotion management tool,Now when we ran this report,data is not getting loaded

3)As part of debugging analysis I have created a new tab(Tab-3) and inserted same objects used in Tab-1,Tab-2

4)Shocking thing is Tab-3 pulls the data but not Tab-1 & Tab-2 rather tab1 & tab2 displaying "X" symbol in report header part

Hope some of you might have come across this peculiar behavior,Please share your experiences

Regards

Bose