ResourceCapacity and Resource.Quantity returns 0 values

[hawkengineer]

Using the code below, CC returns a value of 0 for both capacity and quantity of any resource for the target vessel. Target vessel selected has resources greater than 0.

DATA
{
	type = Vessel
	requiredValue 	= true
	uniquenessCheck = CONTRACT_ACTIVE
	targetVessel1	 = AllVessels().Where(v => v.VesselType() == Station && v.IsOrbiting() ).SelectUnique()

	title = Select Space Station that is in orbit about a orbital body
}

DATA
{
	type = Double
	requiredValue 	= true
	rcap 			= @/targetVessel1.ResourceCapacity(MonoPropellant)
	rcur 			= @/targetVessel1.ResourceQuantity(MonoPropellant)
	rspace 			= @/rcap - @/rcur
	rpercent 		= @rcur/@rcap
	//
	MonoAdd			= Round(@/rspace * 0.80)   		// Increase to 80% of avaialable space
	MonoNew			= Round(@/rcur + @/MonoAdd)   	// Determine the final amount on the station after the resupply mission
	
	title 			= Get current status on resource on the station and calculate amount to add to resupply
}