Welcome to Maximo, Muhammed,
The suggested way to change the Maximo business rules is to use the Automation Scripts application in Maximo. This allows you to program functions the way you want in a way that lets you upgrade Maximo and keep your modifications. Direct changes or extensions to the class files have to be maintained and repeated each time you upgrade. That is not the case when you use Automation Scripts.
Here is a link to our Knowledge Center for information on Automation Scripts:
https://www.ibm.com/support/knowledgecenter/SSWT9A_7.6.1.2/com.ibm.mbs.doc/autoscript/c_automation_scripts.html
Googling will get you much more information.
There is some basic training available at:
https://learn.ibm.com/course/view.php?id=6417
and probably much more on YouTube.
have a good weekend ................dick
#AssetandFacilitiesManagement#Support#Maximo#SupportMigration