Import packages and Compilation issues

hello,
I am trying to compile and import a package in eclipse but it is not working.
Any helpful links or feedback would be helpful.
In the left pane is package explorer.
I right clicked and imported the apache commons .jar files.
The source .java files are in the same project folder.
On the top navigation in Eclispe the Project Button is not showing the build project accessible.

Your problem is really vague. It´s too generic and visually. Please use technically correct terms. Also please tell what error message exactly you got.
As far it sounds like that you don´t understand how classpaths work and how the Eclipse´s buildpath is related to that.

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As per Sorin's post, it would make more sense to use a transformation file and then use *IF mapping functions.
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[http://help.sap.com/saphelp_bpc75/helpdata/en/5A/69200C88AA40C9B18844A25259F147/frameset.htm]
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can anyone provide me the most simple way of:
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