The following updates have been implemented:

One Off Fees
You can now add a one off fee for a swimmer from the swimmers details page as well as the "Add Invoice Period" page. (Admins only)

Click on the "Add One Off Fee" link at the top of the swimmers details page and a form will appear. Fill it in as you would the add invoice period page.

Invoice Credits
Sometimes, for whatever reason a swimmer may pay more than they should do for a given invoice. To have the system record this over payment, view the invoice in question and create a payment receipt for it entering the amount the swimmer paid.

For Example
Say your swimmers invoice was for £10 and they paid £20. Create a payment receipt from the "View Invoice Page" and enter 20 in the "Total Received" field.

When you click "Update Invoice" the system will recognise this over payment and store the remaining amount against the swimmers profile.

Next time you create an invoice for this swimmer, this credit will be taken into account and subtracted from the total invoice amount.

Finance Groups
Something came up when I was discussing the finance side of the system with a user. To cut a long story short, I've decided to add an extra field to the swimmers profile - "Finance Group".

Then, when you are running the invoice periods, you will choose finance group instead of teaching group. This keeps the finance system totally seperate from the teaching groups side and lets the people in your club in charge of swim times and teaching groups etc do what they want with them, and the person in charge of finance can keep everything seperate.