Process ID in Sync Start Process

RE: Process ID in Sync Start Process

Mike Schmitt — Mon, 18 Aug 2025 14:15:24 GMT

[quote userid="157574" url="~/discussions/f/process/39608/process-id-in-sync-start-process/150992"]configures it as an expression[/quote]

On a tangential note - I request they add Output variables for Asynchronous Start Process as well. I know PVs would be inaccessible (or pointless as they'd be unchanged from whatever was passed in), but there are times when I'd like to get the Process Instance ID of the launched subprocess (or other things in the pp! domain i guess) and, of course, you just can't, because the config dialog is hidden when the Asynchronous setting is chosen.

RE: Process ID in Sync Start Process

James Lepone — Mon, 18 Aug 2025 14:11:55 GMT

It will work if she configures it as an expression, that would be as designed Mike Schmitt

RE: Process ID in Sync Start Process

Mike Schmitt — Mon, 18 Aug 2025 13:57:54 GMT

Here is your answer:

You need to configure the Start Process node to refer directly to the process model, not hardcode a PM ID. Like this, Appian will not be smart enough to know what Process Model you're referring to or to access its available PVs.

(edit to add: I see James Lepone beat me to it - i didn't read down-thread before writing my reply lol)

I would also add: if you MUST populate the process model by expression (or just want to experiment), i would guess your output configuration MIGHT still work if you configure it BY EXPRESSION as I originally suggested way up here. I'd be curious to hear whether it works.

RE: Process ID in Sync Start Process

Harsha Sharma — Mon, 18 Aug 2025 13:44:35 GMT

Good catch....I missed to notice the 973 there!

Anusuya K Mahalingam If you are configuring process model using expressions then you can try to configure output using the expressions and let me know how it goes. Otherwise try to configure the process model appropriately using constant or selector and then the pv should be available.

[quote userid="258106" url="~/discussions/f/process/39608/process-id-in-sync-start-process/150979"] Can you open the expression editor besides the ‘Select a Value’ dropdown in the Outputs Section and try to populate the pv from the activity class parameters. You can map the pv within the expression window. Try and share how it goes! [/quote]

RE: Process ID in Sync Start Process

James Lepone — Mon, 18 Aug 2025 13:18:11 GMT

I would suggest not using an expression for your process model and instead use the selector to search for the PM name. If you select the Process Model via that method, the dropdowns will populate as you would expect.

RE: Process ID in Sync Start Process

James Lepone — Mon, 18 Aug 2025 13:17:06 GMT

Unfortunately I do not think either of these above answers are correct. The behavior you are seeing is due to the fact that you have "973" as the expression for your process model. When you select a process model by expression, we can not pre-populate the PV dropdown for you. Instead, you need to use ac!processInfo.pv.pvName as an expression in the value column of outputs. This will be evaluated at runtime properly and return your PV successfully. Let me know if this works for you.

RE: Process ID in Sync Start Process

Harsha Sharma — Mon, 18 Aug 2025 03:01:04 GMT

The configuration looks fine. Can you open the expression editor besides the ‘Select a Value’ dropdown in the Outputs Section and try to populate the pv from the activity class parameters. You can map the pv within the expression window. Try and share how it goes!

RE: Process ID in Sync Start Process

Shubham Aware — Sat, 16 Aug 2025 06:48:49 GMT

It looks like this is not a configuration issue. I would recommend deleting the PVs from both processes and recreating them. Then save and publish both processes, reopen the main process, and try to configure it again. Let us know if the issue still persists.

RE: Process ID in Sync Start Process

Anusuya K Mahalingam — Sat, 16 Aug 2025 06:17:46 GMT

Output Variable Configuration:

Process Model Id is configured:

RE: Process ID in Sync Start Process

Anusuya K Mahalingam — Sat, 16 Aug 2025 06:15:57 GMT

Parent Model

Sync Start Process

RE: Process ID in Sync Start Process

James Lepone — Thu, 14 Aug 2025 13:57:02 GMT

Are you able to provide screenshots of what I asked for before? That would help pinpoint your issue. If your target process model is selected via an expression, then you must enter the ac!processInfo.pv.myPv as an expression, since we can not populate the PV options when the model to start is selected via expression.

RE: Process ID in Sync Start Process

Mike Schmitt — Thu, 14 Aug 2025 13:03:05 GMT

[quote userid="306567" url="~/discussions/f/process/39608/process-id-in-sync-start-process/150927"]I am trying to get the value from pv![/quote]

Any return value you hope to directly map from a PV value would need to (Exactly) match in data type with the PV value. However, if you enter a valid expression for the subprocess value, you can access values that don't exactly match 1:1 with the data types in the parent process - this is very useful, but you have to know what you're doing of course or else the result will potentially seem nonsensical.

RE: Process ID in Sync Start Process

Shubham Aware — Thu, 14 Aug 2025 13:02:50 GMT

Anusuya K Mahalingam
This issue occur only when Data type mismatch between the child process return type and parent process variable types.
But as you already checked that could you share snapshot of both variable.
Also tell us what is the type of Response?

RE: Process ID in Sync Start Process

Harsha Sharma — Thu, 14 Aug 2025 12:07:48 GMT

Hi Anusuya in your screenshot the refresh icons are missing which are genrally there on the setup tab. Can you try to delete this start process node and drag a fresh one from the palette to setup this again and see if pv as well as refresh icons are available.

RE: Process ID in Sync Start Process

Anusuya K Mahalingam — Thu, 14 Aug 2025 04:45:21 GMT

I am trying to get the value from pv!

RE: Process ID in Sync Start Process

Mike Schmitt — Wed, 13 Aug 2025 15:06:16 GMT

[quote userid="306567" url="~/discussions/f/process/39608/process-id-in-sync-start-process/150920"]Same datatype is passed.[/quote]

Are you saying that the data type of "pv!Response" is integer? Because it would need to be that type (specifically) in order for pp!id to show up in your output selection.

RE: Process ID in Sync Start Process

James Lepone — Wed, 13 Aug 2025 13:12:33 GMT

Can you show the process model you have selected in the SPSS Setup tab (to confirm this is set), the variable list of the selected process model (i.e. The Types of the Variables you are selecting from in ac!processInfo.pv), and the variables of the parent model (i.e. Type of "Response") please?

RE: Process ID in Sync Start Process

Anusuya K Mahalingam — Wed, 13 Aug 2025 12:49:16 GMT

Same datatype is passed. Still process variables are not shown.

RE: Process ID in Sync Start Process

Harsha Sharma — Wed, 13 Aug 2025 10:35:14 GMT

For Outputs, this is the expected configuration of start process mode

For Save Target, select a process variable to contain the output.
For Value, select the ProcessInfo property that you want to store in the save target. Like ac!processInfo.pv.processVariable.

So after completion whichever pv data you want Response to have, refer to that using the processInfo property. The type of Response and pv should match for it to be available for configuration .