Swagger/OpenAPI - UnrecognizedPropertyException

Getting below error when using the given request model

"Error 500: javax.servlet.ServletException: org.codehaus.jackson.map.exc.UnrecognizedPropertyException: Unrecognized field "RQSHDR" (Class iseries.wsbeans.ServiceInput.RQSHDR_DS), not marked as ignorable

Request:

"{"RQSHDR":[{"ID":"20423","Name":"226229","DOCTYPE":"EXCEL"}],"RQSLEN":1,"RQSDS":[{"DSID":"148490","DS":"40026","AMOUNT":"250.00"}]}"

Here is sample code:

"ServiceInput": {
"type": "object",
"properties": {
"RQSHDR": {
"type": "object",
"$ref": "#/definitions/rqshdr_DS"
},
"RQSLEN": {
"type": "integer",
"format": "int32"
},
"RQSDS": {
"type": "array",
"items": {
"$ref": "#/definitions/rqsdtl_DS"
}
}
}
}

And
"rqshdr_DS": {
"type": "object",
"properties": {
"ID": {
"type": "string",
"maxLength": 30
},
"NAME": {
"type": "string",
"maxLength": 10
},
"DOCTYPE": {
"type": "string",
"maxLength": 4
}
}
},
"rqsdtl_DS": {
"type": "object",
"properties": {
"DSID": {
"type": "string",
"maxLength": 10
},
"DS": {
"type": "string",
"maxLength": 25
},
"AMOUNT": {
"type": "string",
"maxLength": 12
}
}
},

Please assist to resolve

No source file, test, or entry point is named. Start with the supplied OpenAPI schema and the UnrecognizedPropertyException, then reproduce the request against validator-badge to determine whether the schema or validation behavior is at fault. Done means the cause is confirmed and covered by a focused validation case.