What is so problematic about the homophones 预订 and 预定 when negotiating contracts? I was talking to one of the staff members at LTL Mandarin, and she mentioned that when negotiating contracts (e.g. when moving house) there is an important difference between the following homophones:

预订 (yù​dìng)
CC-CEDICT: to place an order / to book ahead
预定 (yù​dìng)
CC-CEDICT: to schedule in advance

They seem similar in meaning too, so I don't understand why this would be so important.  I'm wondering if someone could describe a hypothetical scenario where the distinction could lead to a disaster.
Question: What is so problematic about the homophones 预订 and 预定 when negotiating contracts?
Usually, 预订 followed by a noun (object);  预定 followed by a verb (action). It is not difficult to tell the two apart.
Example:
预定明天出發 - scheduled to leave tomorrow
预订一打玫瑰 - place an order for a dozen roses
However, let's say you tell a supplier that &quot;想向你們预订 X number of Y&quot; (want to order X number of Y from you), and they agreed and said, &quot;會预定提供 X number of Y 給你&quot; (will schedule to provide X number of Y for you). If they can't deliver on the agreed date, they can argue: 'to schedule to' is the same as 'to prepare to'. It never was a firm order.

预订明天交貨 = ordered (goods), deliver tomorrow (a firm order)

预定明天交貨 = scheduled to deliver tomorrow (not a firm order)


预订 is an official contract. You are expected to pay for the goods and they are expected to deliver the goods
预定 is a 'promise to reserve', that's why we say 向餐館预定一张桌子 (Reserve a table from a restaurant) and say 向傢具店预订一张桌子 (pre-order a table from a furniture store)