Note: the fix already implemented in ZBXNEXT-8275 sub-issue #10 for the master branch. Need to add these changes to releases 5.0, 6.0 and 6.4.

Steps to reproduce:

• Create drule with two unique FTP dchecks e.g:
  -) FTP port 21
  -) FTP port 22
• Update dchecks for newly created drule, so those will be identical:

  {
      "jsonrpc": "2.0",
      "method": "drule.update",
      "params": {
          "druleid": "3",
          "dchecks": [
           	{
                  "dcheckid": "3",
              	"type": "3",
          	"ports": "23"
                  },
                 {
                  "dcheckid": "4",
              	"type": "3",
          	"ports": "23"
                 }
          ]
      },
      "id": 1
  }
  

Result: FTP checks are successfully updated. The same issue appears also updating other dcheks.

Expected: Validation error should appear: "Checks should be unique." The same validation works in drule.create scenario. e.g.