AutoInvoice exception but cannot understand

[runinwind]

hello all,i am using EBS 11.5.4 Autoinvoice, exception raised when importing one invoice with only one row. What confusing is at the interface exception window, it showing a BLANK error message with just the 'Invalid value' column showing '.aa.bb'
1)My Line transaction Flexfield defined a two segments code,combined with INTERFACE_LINE_ATTRIBUTE1 and INTERFACE_LINE_ATTRIBUTE2, and 'aa' is exactly the value in INTERFACE_LINE_ATTRIBUTE1 and 'bb' is the value in INTERFACE_LINE_ATTRIBUTE2.
2)My grouping rule based on INTERFACE_LINE_ATTRIBUTE1 and sort rule based on INTERFACE_LINE_ATTRIBUTE2.
3)The autoinvoice main and import request both completed with status normal and the log seems showing nothing valuable.
4)The log showing none error message.
So, what i shoule check? Thanks in advance!

[anu_uma]

Hi,

Please check the same in the metalink, or please send the screen shot of the same.

Uma