Should be in the context of a Web Service Package or an Application Server Module, public web service should be in the context of a public Application Service Module.
alterWebServiceCommand =  OMBALTER WEB_SERVICE "QUOTED_STRING" ( 
          "renameClause" | "alterPropertiesClause" | ( SET ( REF | REFERENCE ) 
          "setReferencedObjectClauses" ) )
     renameClause =  RENAME TO "QUOTED_STRING"
     alterPropertiesClause =  SET "setPropertiesClause"
     setReferencedObjectClauses =  ( MAPPING | PROCESS_FLOW | TRANSFORMATION | 
          DATA_AUDITOR | TABLE | MODULE ) "QUOTED_STRING"
     setPropertiesClause =  PROPERTIES "(" "propertyNameList" ")" VALUES "(" 
          "propertyValueList" ")"
     propertyNameList =  "UNQUOTED_STRING" { "," "UNQUOTED_STRING" }
     propertyValueList =  "propertyValue" { "," "propertyValue" }
     propertyValue =  ( "QUOTED_STRING" | "INTEGER_LITERAL" | 
          "FLOATING_POINT_LITERAL" )
Set the reference object for the non-public web service. Valid object types including: MAPPING, PROCESS_FLOW, TRANSFORMATION, DATA_AUDITOR, TABLE (tables for change data capture) and MODULE (native modules for change data capture).
Used to set properties (core, user-defined) for Web service. Valid properties are shown below.
Base properties for WEB_SERVICE: Basic properties for Web Service: Name: BUSINESS_NAME Type: STRING(200) Valid Values: Any valid character string in supported character set. Default: Empty string Business name of the Web Service Name: DESCRIPTION Type: STRING(4000) Valid Values: Any valid character string in supported character set. Default: Empty string Description of the Web Service : Name: WSDLURL Type: STRING(4000) Valid Values: Any valid character string in supported character set. Default: Empty string WSDL url of the public Web Service : Name: SPEC Type: STRING Valid Values: Any valid character string in supported character set. Default: Empty string SPECIFICATION of the Web Service :