HOW TO CHECK THE VALUE OF SIGNEDDATA IN LOGIC SCRIPT

Hello Experts,

I have the following scenario.

Account Entity Currency Time Product Category

A

B

C

D

E

There are two calculations involved:

A = B* C

A = D*E

But the check is that if value of Account D is present for same combination of Product , Entity and Category then calculation for A should be like :

A = D* E

the following calculation holds only when there is no data against ACCOUNT D :

A = B*C

I need to implement this via script logic but not finding a way to check the value of SIGNEDDATA.

Pls suggest.

Regards,
SHUBHAM