SAP BO WEBI Variable Count Problem

Hi Experts,

I have a report called Database base status report in that i have to calcualte Count of POBOX the datatype for this object is CHAR at universe level but it should satisfy the user conditions like i have to calculate POBOX not null & POBOX - isnumeric

But i checked the values at Database for this object its showing values like: ,, ,,,,, (camas, blank values String values & NULL )

Note: But i have to calcualte Count of POBOX where POBOX not null & POBOX - isnumeric

I tried so many ways but still am not able to figure out

Kindly help me on this.

I would really appreciate if you could help me the same at your earliest

Thanks & Regards

Kumar