MR 11 error message C+ 171

Hi Guys,

I use MR11 and then I set the flag on chosen PO/item and post the system sends to me message C+ 171 'Error while determining the currency types for ..PO...item...)..Do you have any idea?I have searched in thsi forum and in OSS Note(740579,602965..)wit message C+ 514 515 but about 171 there is nothing..

Thanks in advance for help

Bye