Table Relationship Help

[RyanJ1991]

Hi, I'm still learning access and I'm having some trouble with a database I am trying to make. Below is a photo of the relationships I generated for the proposed invoicing system called Direct Pay Voucher ("DPV"). Here is the set up:

1. Many employees can generate a DPV (we want to track who made the DPV). Therefore one employee can make many DPV's.
2. A vendor can be attached to multiple DPV's
3. A DPV can be paid for from multiple accounts
4. A DPV can be paid through a Purchase Order
5. A Purchase Order is connected to an Account (Encumbrance)
6. An Account has an approved budget based off the fiscal year (although some accounts carry on beyond one fiscal year, if this is an issue i can solve it by manually transfering the funds by to different fiscal year. Example: 100k left in fy 2018 so make account with same number fy 2019 and enter 100k instead of original budget of account)

Does the relationship report below match what I explained above.i am having issues with how to find the current balance of each account. Also how would I show the balance of accounts who don't have a DPV attached to it as of yet??? [Approved Budget]-[Amount]-[Encumbrance]=Balance but what if amount and encumbrance aren't avaiable for the account. How to I design that query???

Thank you for any help you can give me!!