Hi Markus,
thanks for the answer.
The multi-languages in WBS elements comes with EHP 3.
The customer uses ECC 6.0 with EHP 6.
The problem was that the wbs-shorttext in all languages should be the same as project definition shorttext.
I have solved the problem using the badi IF_EX_WORKBREAKDOWN_UPDATE~BEFORE_UPDATE.
In the badi I have updated the wbs-shorttext in all languages with any functions begins with 'CN_LDST.... from the paket CN_LDST.
It was not easy but it works.
Greetings,
Alois Kronbauer