serialization, FORM fixes (#2950)
serialization, FORM fixes (#2950)

* FORM, tdlines duplicated, closes #2949

* FORM, set TDVERSION to constant, closes #2935

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