Thank You DonkeyOte for your reply

Rebuilding the function using VBA is a very usable option, thanks for the suggestion

Using the INDIRECT.EXT means, I believe, installing 3rd party software. This is not an option since we are not allowed to install this.

Did you see my Edit - remarks (the PS), I think our messages crossed each other.

Anyway, I will use my VBA skills again

Thanks
Hein