Hi Satish,
There can be many reasons, as why the transfer posting document are not getting picked up in the auto clearing run.
(a) To start with, check in the auto clearing transaction, FPMA, where the document type XF or the clearing reason 03 is being excluded in the custom selections or not.
(b) If everything is fine, check the clearing steps, that is being configured under the clearing variant, in the SPRO node-
SPRO-->Financial Accounting---> Contract Account AR &AP-->Basic Functions--->Open Item Mgmt.-->Clearing Control-->Define Specifications for Clearing Types--->Define Specifications for Account maintenance.
For clearing type 03 and 04.
(c) If you still couldn't find anything, then you have to check the clearing events, like 0110, 0120 etc.
to check if there is any customization that is causing the issue.
With regards to the picking up of the Credit amt in the Dunning run, there is a configuration at the Dunning procedure level, which controls the behavior of credit during the dunning run.
IMG--->Financial Accounting--->Contract Accounts Receivable and Payable--->Business Transactions--->Dunning--->Dunning by Dunning Procedure-->Configure Dunning Procedure
Select any one of the dunning procedure and click on display.
In there, under the parameters section you will find the "Behaviour of Credit field"
There are three values as follows for this field and is configured as per the business requirement-
0-Dun All Items, Ignore Credit for Dunning Balance
1-Dun All Items, Consider Credit for Dunning Balance
2-Do Not Dun if Credit Exists
Check the value that is set for the Dunning Procedure that is set at the CA level.
Hope it helps..
Thanks,
Amlan