What effect on screen,when applying Patch

Question:
Hi Friends,
Can you clear my doubt !!!.
I added 4 fields in structure CI_P0001 and brought these fields on the sap standard screen. Two days back, basis team applied patches 66,67,68 . After these patches are applied, customer brought fields are vanished from the screen.But there is no change in table and CI_P0001 sctru.I think, May be this patch reset the screen to sap standard.
a. My doubt is applying patch is like upgradation?
b. Eventhough its like upgradation ,it should affect table only know. But here no chane in table . only screen brought back to sap standard.
c.Everytime we have maintain this screen in feature whenever patches are apply?
Thanks and Regards,
sapbaby.
Answer:
Have a look at the transactions SPAU and SPDD, here you cvan see with objects have been hit by the patches, other whise have a look at the modification assistant

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