Impact of deleting Sales Parm data using Sales update history cleanup

We need to purge data from SalesParmLine table due to its large size. There are about more than 12 million rows in SalesParmLine table. We will be using the Sales update history cleanup batch job for purging. I have reviewed the code in the job which is deleting data from following tables till the cleanup date:

SalesParmTable

SalesParmUpdate

SalesParmSubTable

SalesParmLine

SalesParmSubLine 

Now just need to confirm two things here:

1. What will be the impact of it on the references the sys layer classes are using to create invoices? 

2. Does it have any impact on the reports that are using SalesParmLine table (I am aware of Customized reports but need to confirm about default reports)?