Contract scheduled for one months but invoice generated for 1 day ,when terminated Credit memo not g

Hi All,

We have  a contract which did not generated any credit memo after terminating the sub line.

Back ground of the contract:

Contract is billed is scheduled on monthly basis with equal amount 1150 from March 1st '2013 to Feb 28'th 2014

Invoice was interface on Dec 1st '2013 and invoice generated on Dec2 and

This contract is terminated on 2nd Dec but did not generate any credit memo

Observation i could see:

When contract in For the month of Dec Schedule was done from 1st DEC to 31 DEC

But the invoice billing was done only March 1st to 1st DEC i.e. billing was done only for 1 day for month of Dec.