Thanks for your interest.
The reasoning is this.
Actually the container field is a graphic element.
When on screen it is coloured, when printed it is a black an white picture.
so i have a calculation field
X=if(printtoscreen = 1 , Y , Z)
Y and Z are global container fields.
X is a container field.
I want to use a calculation and not a script because a (large) number of fields are involved.
All fields have 10 elements.
Any supported is appreciated
Jitse