When you get the error msg, click the error, to show the msg class & msg no., Please post it.
Possible errors are:
a)Customizing error in DWS - the DWS or its variant absent in the T550A for the PSA grouping (msg cl P2, msg 581)
b) " " in work break sched. (msg cl P2, msg 583)
Ian, Ashish: Pls note:
a. It is only a convention to have day 1 as Monday, 2, as Tue, etc. There is no restriction by any SAP function.
b. Reference date is only to indicate the Day 1 of the PWS. Relative position can be any thing between 1 to 7 for a 1 week PWS, similarly 1 to 14 for a 2 wk PWS. These together determines the how the WS starts for the WSR.
See link