Hi.
Check the name of the i_tdname in the second part when you create the text, because you are using another ID, the first ID is ZINH with the name v_tdname and the second ID is ZCRH with the name i_tdname.
What I think is that the name could have something different.
You can create the sales orden directly using text ID ZCRH and check how it is save on the table, maybe there are some values that you need to pass to the FM create text.
Regards
Miguel