SYMPTOM:
When trying to answer a prompt where it should then filter an element list prompt, A.K.A. prompt-in-prompt or nested prompt, an error message appears in Strategy Web:
ServiceManager: XML syntax error.Message not found in user history list. It may have been deleted from other session already. Please refresh your history list.Filtered element browsing is not supported with a filter that contains prompts.Error in Process method of Component: ResolutionServer, Project xxx, Job xxx, Error Code= -2147213788.

STEPS TO REPRODUCE:
Execute the following in Strategy Tutorial:
CAUSE:
This is a known issue with Strategy Web 9.0.x, 9.2.x, and 9.3.x.
The same report can be executed with Developer.
ACTION:
Strategy is investigating this issue and will post any updates as soon as they become available.
On a related note, refer to:
KB36800 - Error, "ServerManager: XML syntax error.Message not found in user history list. It may have been deleted from other session already. Please refresh your history list." appears on running report with prompt-in-prompt in Strategy Web 9.0.x and 9.2.x
WORKAROUND:
Do not use Freeform SQL as a filter, but use a filter object or a regular report as a filter instead.