Adding to Radek's comments as I discovered similiar issue after our ECC system upgraded to EHP5.
See note 1737535 as there is evidently a change to the extraction coding. For my scenario I was determining period range in abap routine of the infopackage and using 9999012 as my high value in the fiscal period range. For my purposes my low value of range was determined as last month's period. I changed the exit to provide the high value as the current period. I could verify all these scenarios and solutions in RSA3 on the ECC side.
Hope this helps someone with a similar problem.
Lee