I order $400,000 of goods from you. You have to make and deliver those goods to me, and I pay you 30 days after you invoiced me.

Your challenge is to come up with $X00,000 of funding at a time when it's tricky to get loans.

Your other challenge is to either hope your current suppliers can suddenly increase their capacity, or that you can find a supplier who can fill your demand.

If you're making the product you need to employ and train extra staff, and hope they fit in whatever building you have.

And you need place to store raw material, product being built, and built product ready for shipping.

Only a problem if requirement to deliver at once which I don't see why would be the case in most situations. A big order is only a problem to a problem-seeker.