TwoInteger Variable Example

"${VarInt1} + ${VarInt2}" returns the string "20 + 3"
${VarInt1} and ${VarInt2} is replaced with the actual workflow variable values but NO arithmetic calculation is completed. The string with the replaced values is the result.

"${VarInt1 + VarInt2}" will return the calculated value "23"
The variables will be resolved to values and arithmetic calculation on values is completed. The calculated value is the result.
The JUEL expression that returns a string with the replaced workflow variables, and the JUEL expression that returns a calculated value, can be used in applicable node parameters based on business needs for the corresponding workflow node.
The input parameter in Stored Procedure or Macro nodes always requires a calculated value. This means a JUEL expression in a Formula input parameter must return a value such as "${VarInt1 + VarInt2}" (returns the calculated value of "23").