durring error

Hi

while doing dunning parameter tab, showing error as " issue date deviates 92 days from run date.

Invoice posted on 01.09.07, and dunning run date is 21.09.2007.

what is the meaning of " issue date deviates 92 days from run date.

and last i run the same showing below msg also.

F150-dunning -

Customer account was blocked by dunning run.

please reply.

Thankyou

Anil