[Koha] Acquisitions change in Koha 16.11 and forward

[Nick Clemens]

Hello All,

With the current versions of Koha there have been some changes in
acquisitions and how prices are calculated and there seems to be some
confusion in terms and how things are currently being used.

We wanted to clarify what is happening, propose a change and get feedback
on what needs to happen.

When placing an order there are several price fields:
Vendor price (listprice in db)
-This is used to populate the Replacement cost and budgeted cost on the
order page. It is not used against the budget

Replacement cost (rrp in db)
-This is used to calculate the 'budgeted cost/ecost' in the budget - it
also populates the replacement price in the item created by the aqc process
once received

Budgeted cost (ecost in db)
-This is the replacement/rpp minus any discount on the order - this is the
value that will be encumbered when the order is placed

Actual cost (unitprice)
-This is the eventual 'price' of the item and is the encumbered amount once
the item has been received.

With the changes that were made one can no longer adjust the
'Replacement/RRP' once an order is placed - this is because this value is
adjusted for tax in the db (rrp_tax_excluded, rrp_tax_included) and used
for calculating the ecost tax adjusted (ecost_tax_excluded,
ecost_tax_included)

Some libraries have been having issues as they use 'Replacement' cost
mostly for populating items and are not used to it being unable to be
edited and/or affecting budgets.

We are proposing to rename the current 'Replacement cost' field to match
the db value - 'Recommended retail price' (RRP) and add a new 'Replacement
cost' field, editable at any point, that is only used for populating the
item field.

We think this will clear up how the other values are being used and restore
functionality that changed.

Please let us know if this works or what other suggestions you have here.

Thank you,
Nick, Kyle, Jonathan