Why is it not possible to create (or modify) sales contracts in mob. sales?

Dear all,

in our mobile sales installation it is not possible to create or modify "sales contracts".

The contracts get synchronized from CRM but they are only viewable. We checked all the settings in the MSY - but we couldn't find it yet.

My question:

Is this maybe a desired behaviour by SAP? Is there a place where this should be precisely defined?

Thanks and best regards,

Simon