VERIFIED SOLUTION i

MailStream Plus message "One or more WSDATE errors detected, and not posted."

MailStream Plus™- all versions, all platforms

Issue

MailStream Plus™ (MSP) abended.  Near the end of the execution log (.xlg, PRNTXLG, or DD MSRPXLG depending on the platform MSP is running on) it had-
 MSRPMD00   W One or more WSDATE errors detected, and not posted.
 MSRPMD00   E Mail.dat is invalid due to error(s) as reported 

Cause

The mailing is doing Walk-Sequence Carrier Route, and a valid WSDATE (Walk-Sequence update date.) is expected for populating Mail.dat.  And either- 
1) there was no xx INF WSDATE parameter  (xx = RP, EP, or BAT)
or 
2) there was one, but there was no date provided in the data area, or the date was not in an accepted format. 

Resolution

UPDATED: March 14, 2019
Add or correct the xx INF WSDATE parameter.  Please see the MailStream Plus Guide for further information.  

Note, the message "One or more WSDATE errors detected, and not posted." is a warning message, as indicated by the 'W" to the left of it above.  Depending on the value in position 46 of the REPORT MAILDAT parameter, jobs can continue with such warning messages, or they will abend on warning messages.  The default option is for MSP to abend.