Update PF from Input Subfile

> Hi All,
> 
> I  have a problem updating a Database from an input capable Subfile.
> 
> The case is :
>      User change some record from a displayed subfile. And I want this
> changes are updated permanent to the database file.
> 
> What I did:
> READ a record from PF and write it to subfile. After user change some
> record
> and press enter, I use READC. Get the changed record. Now everytime I
> UPDATE
> to the PF, it always give me error RNQ1221
>       "Update or Delete in file MyPF without prior input operation"
> (PS: I did not use the SFLNXTCHG).
> 
> Off course I already do the input in the subfile record. If I do the
> update
> on "subfile record", it work. 
> How to do a dummy input operation before update operation the PF???
> Thank you.
> 
> 
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* This is the RPG/400 Discussion Mailing List!  To submit a new         *
* message, send your mail to "RPG400-L@midrange.com".  To unsubscribe   *
* from this list send email to MAJORDOMO@midrange.com and specify       *
* 'unsubscribe RPG400-L' in the body of your message.  Questions should *
* be directed to the list owner / operator: david@midrange.com          *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *