Hi Richard,
You'll have to fight for those Self-Service users, as I remember going thru the same nightmare when Microsoft changed from the BRL (Business Ready Licensing) model to the Perpetual licensing, back between 2013 and 2015.
The source of our concern was the accumulated Business Portal users licences that had grown to 'unlimited' since the years the company had been using GP, but Microsoft only allowed to convert those 'light' users to self-service users in the new PL model at a ratio of 3 to 1, and they would take the number of users that were purchased during the initial setup, which was something like 250 or 300 light users. HR/PR would have a 500 employee limit which was used for PDK to enter TS & EE Reports, but with the conversion to the Self-Service users, the company would have lost most of them and would have had to re-purchase dozens of light users license so employees could actually use the Web client to enter TS and EE reports.
After much discussion with the partner and Microsoft Sales Ops, we were granted 300 self-service licenses for the conversion from BP to the new GP 2015, as the company had at least 260 employees and was still need some space to grow.. Condition was that the company was up-to-date for SQL CAL's for every single employee computer (yes, those same 260 employees), which wasn't a big deal as we already had some 250 CAL's for SQL.
The transition deal was a terrible setback for most customers that had been using BP for years and were almost forced to buy new licenses to get all their employees access to the web client for time & expense entries.
