Hi Mohammed,
As explain Mariano Cabalen you can surly found more help in the Enterprise Asset Management.
I don´t know the conditions of your calculation, but I can tell you that the link should do it with the orders of PM and not notification.
Reason, the real date impact of works order is in the order and not in the notification.
Please see this link web who show you how how is the link of the impact of the reduction in capacity of equipment and workplace of PP.
Integration between PP module and PM module
And also I advance some points:
In the table AFIH you can have the equipment code and the date with AFKO.
After in EQUZ table enter the Equipment number (EQUNR) and found the GEWRK.
And in the CRHD table enter the value GEWRK in OBJID and take the ARBPL.
Remark: You must select only the PM orders with "ANLZU - system condition down" because you can have maintenance operation with no impact in the equipment. (only check view)
I hope this can help you.
Regards,
Xavier