Goodmorning,

I am having issues with the BOM function since I need to calculate the totalized value of an attribute from the beginning of the year (1-Jan) till the midnight of the beginning of the month (which would be Bom('*').

The problem is that once I evaluate the analysis it gives me two errors:

**- Output: TimeSpan '0' was invalid for the operation** for this analysis **TagTot('etilene', '1-Jan', Bom('*'))**

**- Output: Invalid operation: [Error] * [number] **for this analysis **TagTot('emissionsFlowRate', '1-Jan', Bom('*'))*24**

I hope all is clear.

Thank you in advance

For now I resolved it like this.. is there a more efficient way?

Thanks