SSFO: fix method FX_IDS
SSFO: fix method FX_IDS

Before this commit is applied the FIX_IDS methods was errorneous
and lead to subsequent dump. This commit fixes the algorithm to
replace IDs and IDREFs

EduardoCopat/abapGit,sbcgua/abapGit,larshp/abapGit,EduardoCopat/abapGit,larshp/abapGit,sbcgua/abapGit