The reason to use both straps and invoice for the same. The employee must fill computer two points and when employees at one to fill the computer finish must keep receipts for waste for a period of one month, so the straps are made of PVC, so you can strap to new applications. have Due to the time consuming task of collecting the invoice for that long. And the two employees to fill the computer must keep complete statement of work for a period of 2-3 years, which is too long a time. It is a legacy of the paper mill to reduce costs to increase.