Hi Vishwanath
Check if this works.
Step1
If you do not have a calculation make sure your calculation definitions are as shown below.
In your case it would be VSSALESFCST@REQUEST = SUM("VSASLESFCST@yourplanninglevel").
If you have a calculation, then click on the "+" as shown above in 1 and add your relevant calculation like in the format shown above.
Step2
Click on the table symbol as shown in 2 and make sure the "stored value" flag is set for VSSALESFCST.
Hopefully this will sort those two errors.