Yes Maheswaran,
Your observation is apt. Through OIAL we can not have multiple influencing factors. I always used QQMA0014 for making fields mandatory based upon multiple influencing factors, but Hiding fields is not possible through this route. Then comes the thoughts of exploring Implicit Enhancement points in the program SAPLIQS0. But I doubt that too to Hide fields.
As I said above making a field Mandatory is possible through user-exit based on multiple conditions.
Regards
Maheswaran KD
Also have a look at Enhancement Spot ES_SAPLIQS0 via transaction SE18.
There are a number of DYNPRO_MOD_F05 options under the Name of Modification Unit column that may be of help.
PeteA
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