It happened another case that wareh

It happened another case that warehouse issue D/N without inform invoice department (total 3 case in this month). We don’t know and no receive any document from warehouse, how we can open invoice and collection, cut stock in system ??
If staff who bought it , not come to pay money, how we know this ?
I just worry and afraid the stock diff and can’t prove anything ?
Why you not tell who contact you to buy anything or need product, to contact invoice department first to issue document and then later delivery.
I don’t know other case what you had delivery without document issue from office.