ACME has built a full package and noticed there was a problem with the client package build process for one of the business function objects, B9840 included in CINSTALL library, as it reported…

ACME has built a full package and noticed there was a problem with the client package build process for one of the business function objects, B9840 included in CINSTALL library, as it reported 'ERROR' in the R9621.pdf. Which log file on the Deployment Server should be examined to determine the cause of the business function compile problem?