XSODATA: 'create using' procedure leads to authorization error

Hello all,

I have an odata (xsodata) service in which I want to call a CREATE operation using a procedure: create_new.

service  {    "ccm.data::model.dynamicCase.DynamicCaseView"                      as "MyView"                                     with ( "caseId", "TITLE")                           key  ("caseId")    create using "ccm.data::create_new" ;    }

The CREATE operation works fine if I call the operation without the procedure 'create_new'. However if I want to create an entry with the procedure I get an error in SAPUI5:

{ "error": { "code": "", "message": { "lang": "en-US", "value": "Service exception: insufficient privilege."},
"innererror":{"exception":"exception  1: no.71000258  (ptime\/query\/checker\/query_check.cc:2588)\n    
Not authorized\nNO exception throw location recorded. Stack generation suppressed.\n"}}}

So it looks like I have to give (myself?) an authorization to call the procedure? Is that a right assumption?

Any one encountered this problem?

Any help will be appreciated.

Regards,

Bert