Hi, @Subbulakshmi S Welcome to Microsoft Q&A thanks for posting your question.
Based on the information you have provided, it seems like the issue might be with the CALCULATE function in your DAX expression. The SELECTEDVALUE function is returning a single value, but the CALCULATE function is expecting a column reference.
Can try modifying your DAX expression to use a FILTER function instead of a CALCULATE function. Forecast Table2 = FILTER('Global Sourcing', [Forecast Week Version] = SELECTEDVALUE('Forecast Version'[Forecast Week Version]))
Regards
Geetha