Typo:
e.g.: =IF(SUM(B389:B413)=0,"",SUM(B389:B413)=0)

should read:
e.g.: =IF(SUM(B389:B413)=0,"",SUM(B389:B413))
--
Rgds
Max
xl 97
---
GMT+8, 1° 22' N 103° 45' E
xdemechanik <atyahoo<dotcom
----