Universal Messaging - Increase MaxBufferSize

Product/components used and version/fix level:

Integration Server 10.3 Fix #19
Universal Messaging 10.3 Realm Server Fix #19

Detailed explanation of the problem:

Hello!
I received the request to increase the “MaxBufferSize” attribute in our Universal Messaging Realm from 209715200 to 419430400 bytes due to the detailed error below.
Please,
1 - Is the above change enough to fix the error? Or should we change another attirbute?
2 - Do any restart will be required?

Thanks in advance!

Error messages / full error message screenshot / log file:

[ISS.0153.9009] Unable to send message to webMethods Messaging alias IS_UM_CONNECTION: com.wm.app.b2b.server.dispatcher.exceptions.MessagingSubsystemException: com.pcbsys.nirvana.client.nMaxBufferSizeExceededException: Event data exceeds the max buffer size. Data size is 238604081 and max buffer size is 209715200

Question related to a free trial, or to a production (customer) instance?

Production (Customer) Instance

They want you to double the buffer size, for the error below it looks enough.

From the documentation

As long as you don’t enrich the document and republish it back to um it should be enough. Keep in mind that after increasing that value, UM server and enterprise manager may need more heap space(most likely more then double even though you are doubling the MaxBufferSize). No restarts should be required as long as you don’t increase the JVM heap space.