SAP Note 23307 - Error L03T 0121 V in LT11 and entering item 0000

Symptom:

Error when calling transaction LT11

Cause and prerequisites

Entry 0000 is accepted as an entry although the field is a required-entry field.
In earlier releases this was not possible. This case was not covered by the Basis change.

Solution
Complete module D0121_EINGABE as follows in ML03TI00: module d0121_eingabe.
...
endloop.

tap_tabix1 = 1.
if rl03t-tapos is initial and t340-trtyp <> con_veraendern. "K NEW
* if rl03t-tapos is initial. "K OLD
vordy = con_vordy_liste.
else.
...