Hello Adam,

C# variables are related to a specific Chart, not a specific instrument, ie you could change the main instrument of a given chart, the C#1 value attached to that chart will remain unchanged. This also means that, outside of a specific chart environment, the value stored in a C# is not "linked" anymore to a given instrument. 

Therefore, for a revise order action, the corresponding input price (a limit price in your case), that will be transmitted to the order routing system, really needs to be "associated" with an instrument. This is why the only possible "input" for the Limit Price is a V# variable, as these variables are storing a value specific to a given instrument.

I guess you are either using a SET(C#1,xx) type of statement or maybe a button to calculate your C#1 value. It should be possible to use instead a SET(V#10,xx) type of statement or switch to a Button storing a V#10 Variable. 

Let us know if you are using another method to define your C#1, but in all cases, one needs to use V# Variable as input price for any kind of trading order actions.

Cheers

Eddy

Notes :

a) for example, it is impossible to include any C# variable into a scan or standalone backtest runs (with the C# variables possibly appearing inside custom indicator definitions or in a SET statement). All user variables have to be V# (or T#) variables. 

b) It is possible in a trading order definition to use T# variable for the OrderID reference. In your above definition, you are using the "default" Order ID (of a resting Sell Limit order), which is perfectly fine (as long as you have a single resting limit Sell order). For the record, if you would develop one day a system that would manage multiple resting Sell Limit orders, you would have to use T# variables for storing the specific IDs of each Limit order (at the time of their creation) so that you could reference (each of them) later in possible Revise price (and/or Qty) actions....