BOM repeat region shows information only about assembly/representation, assigned to it. Assembly member location can be shown in BOM only for views of the same assembly/representation. If you show part or subassemly as individual drawing model or member of another assembly/representation, original BOM can not consist any information about them.
To show location of components in BOM you should use only views of the same assembly/representation and blank all other components or create separate table (not repeat region) with parameters &pos_loc:view:<view name> or &sheet:view:<view name> for views of individual components
Edited by: contour