Hard to say. I found following description for num_records at InfoCenter: =========================================================================== Number of records in the member at open time. For a join logical file, the number of records in the primary. Supplied only if the file is being opened for input. =========================================================================== http://publib.boulder.ibm.com/infocenter/iseries/v5r3/topic/dm/rbal3feedb.ht m I guess key words are "at open time". I suspect that's true for all modes where you only do output (_Rwrite) prior to calling _Ropnfbk. What I'm confused about is why would then your workaround work... Also, I'm not sure what last comment really means ("only ... for input"). IBM could definitely improve on descriptions of this value and open feedback area in general. PMR time? :( -----Original Message----- Subject: Re: [C400-L] _Ropnfbk num_records I found a workaround. After _Rlocate() to __LAST, ->rrn = 2, the expected number of records. I just wonder why _Ropnfbk returns bogus data.