VO Transient Attribute referencing the Attribute from another VO

Hi I have an scenario where I have a VO "A" has a transient Attribute say aPeriod, (at any given point the executed VO"A" has only 12 Rows) , I have another VO "B" which when executed gives me exactly 12 Rows with attribute "bPeriod".
I want the 12 Rows of VOA with aPeriod attribute to hold the values from VO"B" attribute bPeriod. Is there any groovy expression / or any View accessor usage which can enable me to resolve this scenario. currently I am achieving this programaticaly by iterating every row of VOA and VOB and assigning aPeriod attribute with bPeriod ( which I am not happy with ).
Please help me if there is any better solution for the same.
Thanks
TK

Thanks for your reply, but there isnt any common attribute between the two VO, I am having VO1.aPeriod attribute has a transient one and VO2 when executed gives me VO2.bPeriod, actually this is a small subset of a bigger scenario.
both VO1 and VO2 are SQL based read only VO. both have same query but both needs two different bind variable bindPeriodVariable = 12 and 24 respectively which returns VO1.xPeriod and VO2.bPeriod, when executed.
I Am supposed to show both VO1.xPeriod and VO2.bPeriod in a single ADF ReadOnly table.
so I thought of having a transient attribute called aPeriod in VO1 and assign it with VO2.bPeriod individually by iterating every row of VO1 and VO2.
I am not pleased with the way I am doing this stuff.
Pls help me with this issue.
Thanks
TK.

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