Callable object for WD java

Question

Hi Experts,
I am new to GP, and i need your help to design my GP.I am a web dynpro developer . I want very basic process to be implemented through GP as follows
1) Employee gets a UI screen for filling some requisition form (in WD java) which wud hit R3
2) Employee's supervisor can Approve / Reject requisition . (UI in WD JAVA)
3) Employee should get a summary of whole process  (Again UI in WD JAVA).
When i am creating calling object for above process and under UI category there are two different type of callable object for wd java
1 ) Web dynpro component (GP interface)
2)  Web dynpro application
when i am creating ( Web dynpro application ) callable object , its giving me error , maybe some config problem .
can anyone just guide me how to implement above process or give me some material through GP (WD java UI) and whats diff between two kinds of callable object.Thanks in advance.
Regards,
Abhay

Answer 1

Hi Abhay,
You can design your process by this way:
1) Employee gets a UI screen for filling some requisition form (in WD java) which wud hit R3
If you need to update R3 at this time, you can create a custom WD Java calling a RFC. To do that, you may use WD with GP API (https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/50d74ada-0c01-0010-07a8-8c118d408e59 ) or you may call your RFC directly by External Service Callable Object (https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/7c313ada-0c01-0010-dfba-9ac88b353a47). It depends of how you will design your process.
IE:
Custom WD Screen that will have input fields and will update R3 -> use GP API
Standard input screen -> use Data Input Form and to update R3 use External Service CO
2) Employee's supervisor can Approve / Reject requisition . (UI in WD JAVA)
You can use Visual Approval standard Callable Object to do that. If you need to update R3 according with approval results, you can insert the External Service CO as next step according with result. To accomplish that you must set Result States.
3) Employee should get a summary of whole process (Again UI in WD JAVA).
Data Display Form standard Callable Object give you exactly what you want.
Scenario 1: WD Custom UI that update R3 -> Visual Approval CO -> Data Display Form
Scenario 2: Data Input Form -> Visual Approval CO -> External Service CO -> Data Display Form
Reward points if itu2019s helpful.