Custom Purchase Order Line types

Summary:

Required to deviate from the standard PO line types 'Fixed Price Services', 'Goods' and 'Rate based services'.

Content (please ensure you mask any confidential information):

Current client is a global organisation. One part of the organisation is already using Purchasing and they use match to receipt and match approval level 3 way for each PO.

The new entities currently being implemented are required to use match to Purchase order and for services PO 2 way match and goods related PO a 3 way match. This requires is to setup separate PO line types for the new entities. Are there any downsides by using 'custom' line types for the PO?