Powerbuilder 12.6.0.4081 Database lock problems!!!

Hi

I hope anybody can help me.

Powerbuilder 12.6.0.4081

Sybase SQL Anyhwere 12

I deploy a webservice. When my mobile device start two webservices at same time, so I have a never ending lock situation:

My code:

sqlca.dbms = "ODBC"

Sqlca.dbparm = "Connectstring='DSN=" + is_mandant + ";UID=" + s_user + ";PWD=xxx' "

Connect;

Update mobile_token

set mto_last_request = :dt_zeit

From mobile_token

Where mto_id = :l_mto_id;

Commit;

Very special:

1.) with PB 11.5.1 it works perfectly!

2.) With sqlca.AutoCommit = True it works --> but this is not a solution for me.

Any ideas???