Use following mapping tables if you need to combine multiple views.

vCustomers

View
 Parent field
 Child field
 Type
 vContacts
 CustomerId
 CustomerId
 1:n
 vSales
 CustomerId
 CustomerId
 1:n
 vInstalments
 CustomerId
 CustomerId
 1:n
 vCatering
 CustomerId
 CustomerId
 1:n
 vTickets
 CustomerId
 CustomerId
 1:n
vContacts

View
 Parent field
 Child field
 Type
 vCustomers
 CustomerId
 CustomerId
 1:1
vFixtures

View
 Parent field
 Child field
 Type
 vTickets
 FixtureKey
 FixtureKey
 1:n
 vSales
 FixtureKey
 FixtureKey
 1:n
 vInstalments
 FixtureKey
 FixtureKey
 1:n
 vCatering
 FixtureKey
 FixtureKey
 1:n
 vVenues
 VenueId
 VenueId
 1:1
vProducts

View
 Parent field
 Child field
 Type
 vInstalments
 ProductId
 ProductId
 1:n
 vTickets
 ProductId
 ProductId
 1:1
vCatering

View
 Parent field
 Child field
 Type
 vCustomers
 CustomerId
 CustomerId
 1:1
 vFixtures
 FixtureKey
 FixtureKey
 1:1
 vCateringLocations
 CateringLocationId
 CateringLocationId
 1:1
vCaterlingLocations

View
 Parent field
 Child field
 Type
 vCatering
 CateringLocationId
 CateringLocationId
 1:n
vInstalments

View
 Parent field
 Child field
 Type
 vCustomers
 CustomerId
 CustomerId
 1:1
 vProducts
 ProductId
 ProductId
 1:n
 vFixtures
 FixtureKey
 FixtureKey
 1:n
vSales

View
 Parent field
 Child field
 Type
 vCustomers
 CustomerId
 CustomerId
 1:1
 vFixtures
 FixtureKey
 FixtureKey
 1:n
vTickets

View
 Parent field
 Child field
 Type
 vCustomers
 CustomerId
 CustomerId
 1:1
 vProducts
 ProductId
 ProductId
 1:1
 vFixtures
 FixtureKey
 FixtureKey
 1:1
vVenues

View
 Parent field
 Child field
 Type
 vFixtures
 VenueId
 VenueId
 1:n