Negative posting issue when clearing.

Hi all,

I have been checking the SAP global documentation about the Negative posting. I do have all the config points, and it is working properly for Reversal, but it is not doing it correctly for clearing

in the example that SAP provides for negative posting

http://help.sap.com/erp2005_ehp_05/helpdata/de/61/52011a76544e41b07e65c8e6e498/content.htm

I do not obtain the negative value on the Credit account.

we create the vendor invoice, and then when doing the partial payment (or total payment) the clearing is created automatically but we do not see the negative posting efect on the vendor account, because the debit does not have the negative entry.

Does someone know where the issue can be?

thanks and regards