Container Issue

I have created a Function SetVariable, with the code below

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// SetVariable

// a = Date

// b = Variable Name

container.setParameter(a,b);

return a;

-

I have used this function in one of the field and when I am trying to retrieve the Value in the just next immediate field with GetVariable function, null value is returned.

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// GetVariable

// a = Variable Name

String var=(String) container.getParameter(a);

return var;

-

Any help would be appreciated.

Regards,

Bharani