HI Manasa,
Note contains SAP correction code that checks the message you customized in above mentioned screen. If the code is missing means changing type from warning to error will not work for message WTY15 008. So two ways you can decide to implement it first
A] Import note in SAP through transaction SNOTE if this is still valid it will be shown as can be implemented status...In this case implement it.as it do not have any side effects.
B] Do the customization of message for WTY15 008 and the do testing in DBM 8.0 without vendor in control for same customer.
C] ask ABAPer to check the code correction in SAP note if it already implemented in DBM 8.0 ..he can do it by check that ABAP objects directly and see the new insert code mentioned in note already exist
indeed you use any this method .
Regards
Ganesh