Can I create new IDOC segmemnt in user exit( edidd structure ) forcefully ?

RFFOEDI1 is the standard driver program which call the below user exit zxf08u06...

Am programing user exit ZXF08U06...

In user exit zxf08u06, actually edidd structue contains all the segments...

In user exit zxf08u06, I am reading each segment which are in edidd structure, pulling required data from database and passing this data into this segment, so that this data appears in the IDOC's segments (we02).

Now I need to create one new segment which is not there in edidd structure.

Still I inserted this new segment and updated data. This new is coming in IDOC out put But IDOC was crested with error . Am I not supposed to create new segment whcih was not there in edidd structure forcefully ?

MUCH THANKS IN ADVENCE.