Variable issue in XSLT template

Hi All,

I have multiple blocks in my XML file. In one of them, will not always populate since it will be restricted with the filter condition.

In XSLT template, we are trying to check if the field in above block is empty then we need to assign zero. 

In below sample XML, we are trying to check if B-F1 has the value or not. As per the logic in extract block B will not populated always in XML.

So, we tried below sample XSLt template code but the variable V1 value is not passing to the subsequent call template code.