Hello,
Thx for all helpful answers. So there was a Web service created using SOAMANAGER and wsdl generated have different restrictions then wsdl on PI System I downloaded wsdl from ERP system through SOAMANAGER and added all char length restrictions to my wsdl on sap PI, now if our provider sends wrong data (too long for example), he got an error already in his side (because of wsdl validation).
Best