A question about parameter passing in Function Call

[Former Member]

Hello Expert,

In our system, there is on Function which is defined as below:

*--------------------------------------------------------------------------------------------------*
* generator called from SAPMKEA3_NEW                                                              *
* by user XXXXXX                                                                                *
* Date: 20.04.2009  Time: 11:00:48                                                                *
* Release: 600        Version: 029                                                                *
* template program RKEVRK1V                                                                        *
*--------------------------------------------------------------------------------------------------*

FUNCTION RKE_WRITE_ACT_LINE_ITEM_1000.
*"----------------------------------------------------------------------
*"*"Verbuchungsfunktionsbaustein:
*"
*"*"Lokale Schnittstelle:
*"  IMPORTING
*"    VALUE(I_SCHEDMAN_KEY) LIKE  SCHEDMAN_KEY STRUCTURE  SCHEDMAN_KEY
*"      OPTIONAL
*"  TABLES
*"      LINE_ITEM_TAB STRUCTURE  CE11000
*"----------------------------------------------------------------------

PERFORM WRITE_ACT_LINE_ITEM(RK2A1000_UPDATE)
                                  USING    I_SCHEDMAN_KEY
                                  CHANGING LINE_ITEM_TAB[].

ENDFUNCTION.

In dubugging mode, the function is called via dynamic statement

PERFORM (VBFUNC) IN PROGRAM (TFDIR-PNAME) USING VBID.

The value of each parameter is as below:

VBFUNC:                    RKE_WRITE_ACT_LINE_ITEM_1000

TFDIR-PNAME:          SAPLKEV1

VBID-TIMESTAMP:      504F19F060AE29D0E10080000A19031E

VBID-ID:                    1

In debugging mode, I find internal table LINE_ITEM_TAB has two records. My question is, since the calling program doesn't pass the parameter to LINE_ITEM_TAB, why the internal table has two records? Where they come from?

Debug screenshot is also attached.

Can any expert explain to me?

Thanks in advance,

Best Regards,

Johnny.

[RaymondGiuseppi]

No the perform doesn't call the FM it call a FORM which itself call the FM, check source code of the form  RKE_WRITE_ACT_LINE_ITEM_1000 in program SAPLKEV1 (function group), it should "recover" data from the VBID structure. (As it is a generated function group I cannot check on my system)

Regards,

Raymond