Activity Chaining Issue

forum.appian.com/.../Post-Install_Configurations.html
That looks correct, per documentation. Have you restarted your server?

Yes, we did many times but still seeing the same error.

Other things to consider -

1. For multi server environments ensure the property is in place on all relevant servers
2. For ACM environment its the custom.properties in runtime_ear and not ear that needs to be updated

Note that the best practice is not to increase this value but to re-design the application(s) to be within this default limit

No it's not a multi server/ACM environment.

@Jayshrib: have u faced any issue on the system or any adverse impact on the system after increasing the limit to 100?

Configuring the activity chaining limit to 100 will not in and of itself cause performance issues on your system. Understanding the performance impact is dependent of what is chained, how the user interacts with that process flow, and what kind of load the process will put on the system across active processes.

The reason raising the limit is not recommended is that a chain that large is a red flag that there could be problems and the design should be reviewed for optimization. I would argue it is pretty rare that a chain that large doesn't have a negative impact on system performance or user experience.