IDoc - Get Segment Definition or Version in Code

Question

I'm working on the ABAP-PI Port, created a FM based on FM OWN_FUNCTION now.
In my FM, there is a call to a function
CALL FUNCTION 'EDI_SEGMENTS_GET_ALL'
that retrieves all the segment data for a particular IDoc number.
However, it returns only the segment name EDIDD-SEGNAM and not the segment definition.
Example:
Value returned: "E1EDKA1" ( EDIDD-SEGNAM , 27 char long field)
I'm actually looking for the Segment Definition that goes up to 30 characters long.
Value I need to be returned: "E2EDKA1001" - has the extra 3 digits at the end that represents the Version.
If you go to WEDI, Development > IDoc Segments, You can see that the Segment definitions belong to a data type EDISEGDEF (30 characters long).
Does anyone know how I can get this programmatically?
The IDoc file downloaded by the FILE port stores the 30 char Segment Definition in the file
Using the ABAP-PI it only returns the segment name (27 char)

Answer 1

Hi all,
Thanks for your replies.
EDISDEF might be useful, but I'm not sure how to use it at the moment.
I am supplied in the code a structure of type EDIDC, which has the following values (not all are listed)
MANDT     C     3      308
DOCNUM     N     16      0000000000002050
DOCREL     C     4      640
STATUS     C     2      03
DOCTYP     C     8
DIRECT     C     1      1
RCVPOR     C     10      SUBSYSABAP
RCVPRT     C     2      B
The above represnets a particular IDoc being processed (see DOCNUM and DOCREL)
The default code then uses a FM to get the segment data based on the DOCNUM.
CALL FUNCTION 'EDI_SEGMENTS_GET_ALL'
      EXPORTING
           DOCUMENT_NUMBER         = I_EDIDC-DOCNUM
      TABLES
           IDOC_CONTAINERS         = I_EDIDD
      EXCEPTIONS
           DOCUMENT_NUMBER_INVALID = 1
           END_OF_DOCUMENT         = 2
           OTHERS                  = 3.
Does anyone know of any FM that returns a EDID4 (has 30 char segment version) structure instead of a EDIDD structure (27 char seg def)?
And the value EDIDC-DOCREL (SAP Release for IDoc)  e.g.
<b>640</b>
does not match up with values available in EDISDEF-RELEASED (IDoc development: Release of segment definition), e.g.
<b>30F
40A
45A
</b>
How can I find if the segment definitions are
E2EDKA1 or
E2EDKA1001 or
E2EDKA1002 or
E2EDKA1003