Letter of Credits and Drawings

Hi,
I am looking for someone interested in LC module in R10.
We have some problems about limit transactions and wrong re.consol.spec.entries, so i wonder that is there any LC users that my be we have same problem and we can solve problems each other.
thanks and regards.

Prb.1 )Open Partial LC and input comfirmed DRAWING with drawing type DP (defered payment). System sometime does not redused from liability amount. The field 170. confirm amount below 0. However we do not input "unconfirm amount" which field seq is 174. System why does not reduced liab amount?
Prb.2 )Open unconfirmed LC and than changed LC type unconfirmed to confirmed . Input DRAWING with drawing type CO (Collection) as ON.APPRVL (it means reduced liab). System does not redused liability amount.
Prb.3 )Open confirmed LC , input DRAWING with drawing type CO as reduced liab, change DRAWING type CO to SP (sight payment). System creates wrong spec.entries as reduced liab with duble amount...