Norsand model is a CPP model, when the properties are extracted from or assigned to a zone, an intrinsic fish function named ‘z_prop()’ should be used, e.g.:
ex_1(ii,jj)=z_prop (ii,jj, ‘bulk_current’)
z_prop (ii,jj, ‘bulk_mod’)=ex_1(ii,jj)
Check: Use z_model(),z_prop() and z_group(). to access model and properties
or page 2 - 47 in the Fish Reference manual for more details.