Get an error at calling dialog of reservation creation in SAP R/3
Through SE35,I made a dialog module "ZMM_DIALOG_RE_CREATION".
Its program is SAPMM07R and screen number is 500.
I called this dialog module in my program "SAPMZMB21",the transaction code is ZMB21.
When I executed ZMB21,an error arised.
The error is "Check table 158:entry ZMB21 does not exist."
I found that SAP standard program of reservation creation checks the table T158.
My defined transaction code ZMB21 really did not exist in table T158.
So how should I do?