Must be singular

The following returns an error: "the left operand of <= must be singular.

How can I make the left side singular?

((xpaths “/DeploymentManifest/CompositeStudioProject/@deploymentVersion” of xml documents of files “C:\ProgramData\PROD.manifest” as text) as string as version) <= “4.11”

Got it. Needed to use the “unique value” statement.

unique value of ((xpaths “/DeploymentManifest/CompositeStudioProject/@deploymentVersion” of xml documents of files “C:\ProgramData\Apria Healthcare\Pega\ANA\ANA-PROD\ANA-PROD.manifest” as text) as string as version) <= “4.11”