Create endpoint to directly insert invoice candidates

[metas-ts]

Is this a bug or feature request?

What is the current behavior?

Which are the steps to reproduce?

What is the expected or desired behavior?

[metas-ts]

Dev-Test / Documentation

Check out the sagger-documentation at {{baseURL}}/swagger-ui.html#/invoices-rest-controller-impl/createInvoiceCandidatesUsingPOST

Invoke {{baseURL}}/api/invoices/createCandidates with this request pody:

{
  "items" : [ {
    "orgCode" : "001",
    "externalHeaderId" : "externalHeaderId_unique3",
    "externalLineId" : "externalLineId_1",
    "poReference" : null,
    "billPartnerIdentifier" : "val-G0001",
    "billLocationIdentifier" : null,
    "billContactIdentifier" : null,
    "productIdentifier" : "val-P002737",
    "soTrx" : "SALES",
    "invoiceDocType" : null,
    "invoiceRuleOverride" : "Immediate",
    "presetDateInvoiced" : null,
    "dateOrdered" : null,
    "qtyOrdered" : 10,
    "qtyDelivered" : null,
    "uomCode" : null,
    "priceEnteredOverride" : null,
    "discountOverride" : null,
    "lineDescription" : null
  },
  {
    "externalHeaderId" : "externalHeaderId_unique3",
    "externalLineId" : "externalLineId_2",
    "billPartnerIdentifier" : "val-G0001",
    "productIdentifier" : "val-P002737",
    "soTrx" : "SALES",
    "qtyOrdered" : 10,
    "qtyDelivered" : 9,
    "lineDescription" : "testlinedescr"
  }]
}

Notes:

• the first item explicitly sets the orgCode; the 2nd one goes with the user's org
• the first item explicitly sets the invoiceRuleOverride; the 2nd one goes with the bpartner's invoice-rule (after delivery in this case)

Take a look in the webui

The ICs were creted as specified;
They can also be invoiced like any onther IC