IF_ISM_MSO_BASICDATAUPD_CHECK is a standard SAP object class available within R/3 SAP systems depending on your version and release level. You can view/maintain the class details by entering its name into the relevant SAP transactions such as SE24, SE80 or even SE84. Below is the documentation available for class IF_ISM_MSO_BASICDATAUPD_CHECK including details of:
A method is a coding block that performs a certain procedure (i.e. ABAP functionality) on an object within the overall SAP class. In simple terms if the object is an SAP database table a method could be the procedure to add a record or to delete a record. If you are new to OO in many respects, the implementation of a method is similar to a function module and can be called in a very similar way using CALL METHOD.
Instead of "CALL FUNCTION", Methods are referenced using the following syntax: CALL METHOD =>methodname EXPORTING/IMPORTING....
|CALL METHOD if_ism_mso_basicdataupd_check=>APPL_PROCESSING...more details|
|CALL METHOD if_ism_mso_basicdataupd_check=>INBOUND_PROCESSING...more details|
|CALL METHOD if_ism_mso_basicdataupd_check=>OUTBOUND_PROCESSING...more details|