Variable functions are not recognized in Acrobat Reader DC

Using LiveCycle Designer ES4, I have created variable functions in JavaScript that I call in field events.  These functions work correctly in Adobe 11.  However, when tested in Acrobat Reader DC, these functions no longer work.  If I move the script from the function into the field event, the script works.  However, I do not want to stop using variables.  Many of these variables are long and used in many fields.  Does anyone have a fix for this issue?

Below is an example of one of the JavaScript variable functions currently being used in Adobe 11:

form1.#variables.EnterFieldFC - (JavaScript, client)

function EnterFieldFC(oField)

{

oField.border.edge.presence = "visible"

Field.border.edge.color.value = "255,0,0"

Field.borderWidth = "1.5";

}

Below is the call in the Enter field event:

EnterFieldFC.EnterFieldFC(this);

When the JavaScript Debugger is enabled in Acrobat Reader DC, an error message is displayed on entering the field stating that the function EnterFieldFC is unknown.