OSID - osid.acknowledgement.CreditBillingAssignmentSession Service Interface Definition

Interface	osid.acknowledgement.CreditBillingAssignmentSession
Implements	`osid.OsidSession`
Description	This session provides methods to re-assign `Credits` to `Bilings.` A `Credit` may map to multiple `Billings` and removing the last reference to a `Credit` is the equivalent of deleting it. Each `Billing` may have its own authorizations governing who is allowed to operate on it. Adding a reference of a `Credit` to another `Billing` is not a copy operation (eg: does not change its `Id` ).
Method	canAssignCredits
Description	Tests if this user can alter credit/billing mappings. A return of true does not guarantee successful authorization. A return of false indicates that it is known mapping methods in this session will result in a `PERMISSION_DENIED.` This is intended as a hint to an application that may opt not to offer lookup operations to unauthorized users.
Return	`boolean`		`false` if mapping is not authorized, `true` otherwise
Compliance	`mandatory`		This method must be implemented.
Method	canAssignCreditsToBilling
Description	Tests if this user can alter credit/billing mappings. A return of true does not guarantee successful authorization. A return of false indicates that it is known mapping methods in this session will result in a `PERMISSION_DENIED.` This is intended as a hint to an application that may opt not to offer assignment operations to unauthorized users.
Parameters	`osid.id.Id`	`billingId`	the `Id` of the `Billing`
Return	`boolean`		`false` if mapping is not authorized, `true` otherwise
Errors	NULL_ARGUMENT		`billingId` is `null`
Compliance	`mandatory`		This method must be implemented.
Method	getAssignableBillingIds
Description	Gets a list of billings including and under the given billing node in which any credit can be assigned.
Parameters	`osid.id.Id`	`billingId`	the `Id` of the `Billing`
Return	`osid.id.IdList`		list of assignable billing `Ids`
Errors	NULL_ARGUMENT		`billingId` is `null`
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	getAssignableBillingIdsForCredit
Description	Gets a list of billings including and under the given billing node in which a specific credit can be assigned.
Parameters	`osid.id.Id`	`billingId`	the `Id` of the `Billing`
Parameters	`osid.id.Id`	`creditId`	the `Id` of the `Credit`
Return	`osid.id.IdList`		list of assignable billing `Ids`
Errors	NULL_ARGUMENT		`billingId` or `creditId` is `null`
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	assignCreditToBilling
Description	Adds an existing `Credit` to a `Billing.`
Parameters	`osid.id.Id`	`creditId`	the `Id` of the `Credit`
Parameters	`osid.id.Id`	`billingId`	the `Id` of the `Billing`
Errors	ALREADY_EXISTS		`creditId` already assigned to `billingId`
	NOT_FOUND		`creditId` or `billingId` not found
	NULL_ARGUMENT		`creditId` or `billingId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	unassignCreditFromBilling
Description	Removes a `Credit` from a `Billing.`
Parameters	`osid.id.Id`	`creditId`	the `Id` of the `Credit`
Parameters	`osid.id.Id`	`billingId`	the `Id` of the `Billing`
Errors	NOT_FOUND		`creditId` or `billingId` not found or `creditId` not mapped to `billingId`
	NULL_ARGUMENT		`creditId` or `billingId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	reassignCreditToBilling
Description	Moves a `Credit` from one `Billing` to another. Mappings to other `Billings` are unaffected.
Parameters	`osid.id.Id`	`creditId`	the `Id` of the `Credit`
	`osid.id.Id`	`fromBillingId`	the `Id` of the current `Billing`
	`osid.id.Id`	`toBiillingId`	the `Id` of the destination `Billing`
Errors	NOT_FOUND		`creditId, fromBillingId,` or `toBillingId` not found or `creditId` not mapped to `fromBillingId`
	NULL_ARGUMENT		`creditId, billingId,` or `toBillingId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.