How can I close ODP in named actgrp?

I have the following problem:
- Interactive program Pgm1 (called from menu), created with DFTACTGRP(*NO), 
therefore running in QILE;
- Module Mod1 inserted in a srvpgm, created with ACTGRP(*CALLER), which uses a 
file File1 with USROPN and ends with RETURN without closing File1.
 
Pgm1 calls repeatedly Mod1 (just for this reason Mod1 does not close File1, so 
to speed up execution time), then ends with CLOSE(*ALL) and *INLR =*ON.
 
After Pgm1 has ended, if I check the list of open files of interactive job from 
Pgm1 has been launched from, I find File1 too. Assumed that RCLRSC (and its 
corresponding API) does not work on named activation groups, how can I close 
File1 from within Pgm1, without having to end the whole activation group QILE?
Thank you,
Paolo Coita