BAPI_GOODSMVT_CREATE (in line item, missing mseg-sgtxt in doc. generated)

Hi all....

I'm using this bapi to creat material documents (without purchase orders or anything like that).. In line items I fill field item_text, but when mm document is generated, mseg-sgtxt is empty. Anyway, bapi works fine, but this field is missing....

Is it the way that this bapi should works??

Thanks from Barcelona......