Why can't I search for entities that have a specific crossvalue value and a source type?

Question

If we perform the following API:

GET https://<envirnoment>.reltio.com/reltio/api/<tenantId>/entities?filter=equals(type,"configuration/entityTypes/Individual") 
AND equals(sourceSystems,"<source name>") 
AND ( *equals(crosswalks.value,"<crosswalk value>"))&select=uri,attributes,crosswalks

This will return the expected entity.

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However, if we perform the following API:

GET https://<envirnoment>.reltio.com/reltio/api/<tenantID>/entities?filter=(equals(type,"configuration/entityTypes/Individual") 
AND equals(sourceSystems,"<source name>") 
AND ( equals(crosswalks.value,"<crosswalk value>")))&select=uri,attributes,crosswalks

This returned a single entity that was incorrect.

Answer

If you apply the following:

equals(sourceSystems,"FACETS") AND ( equals(crosswalks.value,"04864575401_20140301")

The entity that was returned had both a source system that equals to "FACETS" and a crosswalk value of 04864575401_20140301.  Both are satisfied.  The filter for "GET /entities" does not check whether 04864575401_20140301 value is from FACETS source or not,  

The alternative way is to perform the following API in POSTMAN to find a crosswalk value that is also correlated with a specific source.

GET https://<enviorment>.reltio.com/reltio/api/<tenantId>/entities/_byCrosswalk/04864575401_20140301?type=FACETS

Reference

https://docs.reltio.com/entitiesapi/getentitybycrosswalklist.html.