How to Grab Debug Log

a)set the following profile at user level

FND: Debug Log Enabled = Yes
FND: Debug Log Level = Statement
FND: Debug Log Filename = leave it as null
FND: Debug Log Module = %

b) select max(log_sequence)
from fnd_log_messages;

c) Now Reproduce the issue

d) select *
from fnd_log_messages where log_sequence > <retrieved from first query>