01. A control system is needed especially for the followings:
- Deleted Bills is kept or dispose
- Negative stock quantity is allowable or not-allowable.
- Safety control password for
a. Selling below cost : will result changes of product profit margin
b. Minimum Selling price : result changes of product profit margin
c. Selling above credit limit : giving more credit term for customer
d. FOC item : result changes of product profit margin
e. Edit Bills : for any editing bills, require password confirmation
f. Delete Bills : whenever for deleting any bills, a password is required
g. Second Print control : when printing more than once is required.
02. Menu accessed control
03. Detail item accessed control
04. Checking who keyed, modified, delete the transaction and when.
05. User Login / Logout and when.
06. User access menu flow.
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