Hi there - Peter Keller writes: > _diffrn_refln.wavelengh_id is missing _item.mandatory_code > (and _item.category_id wouldn't do any harm either). You are right about the missing mandatory code. This data item is a pointer to its parent, and we have made it the style of this dictionary to restate the _item.mandatory_code for such data items, despite the fact that it has already been given in the tree attached to the parent data items. But we has also made it our style not to add the _item.category_id. Hence, the action I have taken is to add the _item.mandatory_code but not add the _item.category_id. Thanks for finding this - Paula ******************************************************************************** Dr. Paula M. D. Fitzgerald ______________ voice and FAX: (908) 594-5510 Merck Research Laboratories ______________ email: paula_fitzgerald@merck.com P.O. Box 2000, Ry50-105 ______________ or bean@merck.com Rahway, NJ 07065 USA (for express mail use 126 E. Lincoln Ave. instead of P. O. Box 2000) ********************************************************************************