Upgrading sap programs from one version to another version

Hi All,
  I want to know how to upgrade sap programs from one version to another version,Please help me...
Regards,
Raj.

The seriousness and the complexity of the upgrade is primarily dependent on the version of the older SAP system. The Upgrade from 4.6 -> 4.7 is relatively easier and faster than that of an upgrade from 3.0 -> 4.7.
Most of the <b>function modules</b> in the older system have been reworked and would be marked as obsolete in the target version. (This could be seen in EPC Error Analysis & warnings).For example Function modules like Upload, Download, WS_Download, WS_Upload,WS_File_Delete, WS_Filename_get, Popup_to_confirm_step etc.  These obsolete Fm's can be easily replaced with Fm's like Gui_Upload,Gui_Download, etc. There are few other complex Fms for which you have to do through R&D to find out the replacements.
Apart from replacing obsolete Fms one has to correct those <b>syntax errors</b> that may occur in the target version. There is a lot of variations in Syntax standards across versions.
Further more many <b>transactions</b> would have been reworked. Some Fields would be missing in the old system or a field would have been made a Key-Field in the new version , some screens would be missing or would have been addded. Also some <b>Tables</b> would have been flagged as obsolete and we need to find replacement for those obsolete Database tables.
It would be wise to do a R&D for all the programs in the system before Upgradation. This would really give us an idea about the complexity of the task and we can plan our Upgrade work effectively. 
regards,
cartik
       <b></b><b></b>

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