Set Text Account with Attribute Value

Summary:

Is there a way to assign a Text Account with an Attribute Value? I'm trying to use a regular rule but it is not working. A couple examples of what I tried below.

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Code Snippet (add any code snippets that support your topic, if applicable):

SET AGGMISSG ON;
SET UPDATECALC OFF;
SET COPYMISSINGBLOCK OFF;
SET EMPTYMEMBERSETS ON;


FIXPARALLEL(6,   @RELATIVE("Total Project - Customer",0))
FIX (

     "Forecast",						/*DIM:Scenario*/	
     "OEP_Working",						/*DIM:Version*/	
     "No Entity",						/*DIM:Entity*/	
     "No Year" ,						/*DIM:Years*/
     "No Currency"                      /*DIM:Currency*/
     )

	FIX("No Product")

        FIX("AC_Customer Attribute"
            )
		CLEARDATA "Begbalance";

    	ENDFIX
               
        /*
        ===============================================================================================
        AC_Customer Attribute is a Text Account
        
        "AC_Customer Attribute" = [[PlanningFunctions.getIdForString("foo_bar")]];