Hi
In ERP 2004 solution, SAP delivered the new ESS Solution that is WebDynpro based. To give all the ESS applications (including ESS country version services) similar UI they came up with a framework and called it FPM Framework.
FPM - The floorplan manager (FPM) is the central part of the XSS Business Package(along which its provided). It can be said to be the base of all self sevices. Any WebDynpro application that implements FPM is known as FPM Application. So all the ESS Applications in ERP 2004 are FPM applications.
FPM provdes 4 basic interfaces that are implemented by the Self Services WebDynpro Applications,
1) IVAC (for the Visual Application Component - Vc)
2) IBLC (for the Business Logic Component - Fc)
3) IXssAppConf ( for the Configuration Component - Cc)
4) IFPM (It gives the self service application access to the FPM and its utility classes)
All these above interfaces are provided with FPM Development Component xssfpm. Apart from this there are some other central components that are used by many ESS application which are provided in xssutils DC.
All the ESS WebDynpro application use the above two components in the Used DC section of their dc.
If you want to modify any ESS Application, you need to have the source code of these XSS DC's as well in your Design Time, else it will give you build errors.
For this you need to have a JDI setup since the ESS and XSS are provided in two different tracks of DTR.
As far as I know because of the used dependency of ESS Applications, using JDI is the best (and only) option to modify the ESS WebDynpro Applications.
And then implementing the JDI, helps in version management plus lot of other advantages which you can find in SAP Help.
Hope this answers ur question
Regards
Krishna
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