Creating relationship (with properties) from CSV between two groups of existing nodes

Neo4j Graph Platform Cypher
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2

I have tried the below but I get a Cartesian product warning " This query builds a cartesian product between disconnected patterns."

USING PERIODIC COMMIT 500
LOAD CSV WITH HEADERS FROM 'file:///Relationships.csv' AS csvLine
MATCH (c:Client {CLIENT_ID: toInteger(csvLine. TECH_CLIENT_ID)}),(r:RelatedParty {RELATEDPARTY_ID: toInteger(csvLine. RELATEDPARTY_ID)})
CREATE (c)-[:AssociatedWith {RELATEDPARTY_TYPE: csvLine.RELATEDPARTY_TYPE}]->(r)