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How to populate Mail.dat Field Code MPU-1102 (Mail Piece Unit Description) and CPT-1101 (Component Description) in MailStream Plus

Product affected: MailStream Plus™ 8.3.7, all versions, all platforms
Mail.dat Field Codes MPU-1102 (Mail Piece Unit Description) and CPT-1101 (Component Description) get populated with the same information using the same subkeyword 'PUBNLM'.  
PUBLNM is used on a PA INF parameter to link to particular P ATTR parameter or parameters(s), or an L can be used in position 8 to have the PA INF used with all P ATTRs in the job.

For more information about subkeyword PUBLNM and the PA INF parameter, please refer to the MailStream Plus™ Guide
UPDATED:  May 15, 2019