Software suggestions

We are in need of updating our software.
medium sized company
we are a b2b wholesaler
requirements
need a complete program
sales - order entry
purchasing
inventory control
accounting (prefer with payroll)

what is making this difficult is that we have to have the following:

1 - must have kitting ability
2 - must have ability to disassemble kits
3 - must have landed cost

If anyone could make some recommendations I would be grateful.
Yes there are still lots more criteria but if we can hit these 3 off the bat it would help me reduce the quantity of software.

I think it is better to contact the developer of your software, they will be able to update.

No they will not update. The software is written in COBOL. They are closing down after this year. Unfortunately the software is way more advanced that anything I have reviewed. Yes even SAP. Yes I have tried to interest other companys/programmers into taking on converting this software but so far no luck. If it were possible we would not change but that is not an option.
Thank you anyway.