Ripple XRP Ledger - Cant get transaction validated (Testnet)

Im using testnet to validate my transaction, transaction :

{"transaction":"ECAB482EB34177FA1B1E6C724F038C42308004B1F307A169FAEA88C825E11642","command":"tx","id":0}

Response :

{id=0, status='success', errorMessage='null', result=TxResult{validated=false}}

Im using websocket , method 'tx' to check. What is the best course of action to figure out problem, is there a way to see reason this is not validated on some of the testnet validators?

Im connected to wss://s.altnet.rippletest.net:51233 ,address i use is rKHDh61BpcojAoiATgJgDaVwdSJ64fGNwF. Can someone help?

Fee is at 1 000 000 drops. This is the transaction blob 1200002200000000240000000061D4838D7EA4C680000000000000000000000000005553440000000000C882FD6AB9862C4F90E57E1BA15C248CABAD5BF96840000000000F42407321033BF063167F21FF6C01045B4E2F03F519879B552D2611F0E885E01F08C88D15247446304402202E90609AAFBF4C105408CFF2377D48085879BEE3C7DE57AF125F73926284362A022002D7A487F5929F9A3E1050FC2B5D6AE1DD5384647AD1ABF6D322765F0ABE0A498114C882FD6AB9862C4F90E57E1BA15C248CABAD5BF983148DC6B336C7D3BE007297DB086B1D3483DEA24C2A

Is my transaction fualty ? Then why was it corrently submited to the network ? Seems like its valid, bud why its not validated and hence finalized in ledger?

Note : responses use my internal model to represent some properties, hence thats why names might be slightly different and some properties ommited.

Result from 'submit' call :

Result :SubmitResult{engineResult='tefPAST_SEQ', engineResultCode=-190, engineResultMessage='This sequence number has already passed.', txBlob='1200002200000000240000000061D4838D7EA4C680000000000000000000000000005553440000000000C882FD6AB9862C4F90E57E1BA15C248CABAD5BF96840000000000F42407321033BF063167F21FF6C01045B4E2F03F519879B552D2611F0E885E01F08C88D15247446304402202E90609AAFBF4C105408CFF2377D48085879BEE3C7DE57AF125F73926284362A022002D7A487F5929F9A3E1050FC2B5D6AE1DD5384647AD1ABF6D322765F0ABE0A498114C882FD6AB9862C4F90E57E1BA15C248CABAD5BF983148DC6B336C7D3BE007297DB086B1D3483DEA24C2A', txJson=TxJson{transactionType='Payment', account='rKHDh61BpcojAoiATgJgDaVwdSJ64fGNwF', destination='rDveJyEotoUp9jCD1Ghi2ktEBnhHiA6RBB', amount=Amount{currency='USD', value=1, issuer='rKHDh61BpcojAoiATgJgDaVwdSJ64fGNwF'}, fee='1000000', flags=0, sequence=0, signingPubKey='033BF063167F21FF6C01045B4E2F03F519879B552D2611F0E885E01F08C88D1524', txnSignature='304402202E90609AAFBF4C105408CFF2377D48085879BEE3C7DE57AF125F73926284362A022002D7A487F5929F9A3E1050FC2B5D6AE1DD5384647AD1ABF6D322765F0ABE0A49', hash='ECAB482EB34177FA1B1E6C724F038C42308004B1F307A169FAEA88C825E11642'}}

I submited it few times , so 'tefPAST_SEQ' is present.

Solution

Looks like your transaction object has sequence field in it.
According to THIS your sequence can be auto-filled. It can be set manually in case you'd want to submit multiple transactions at once by incrementing them manually.
This gives you control over the order of the transactions to be executed in certain order. If that doesn't matter you can just go without setting the sequence.

In your case your account looks like this (using account_info):

{
"result": {
    "account_data": {
        "Account": "rKHDh61BpcojAoiATgJgDaVwdSJ64fGNwF",
        "Balance": "10000000000",
        "Flags": 0,
        "LedgerEntryType": "AccountRoot",
        "OwnerCount": 0,
        "PreviousTxnID": "12CA4E5AAF4198155FF3F16E53D35353B051F4AB5E01749833202339B48D187A",
        "PreviousTxnLgrSeq": 11450559,
        "Sequence": 1,
        "index": "169B6BA91A54B2EC86EFB618995A59E76F07853BB88AF231776118339FFD7268"
    },
    "ledger_hash": "449E3420C6B1C6959FA794066264432EF4E98543B0C6582B00D6CD28DE33B8F8",
    "ledger_index": 11523855,
    "status": "success",
    "validated": true
}

See the result.account_data.Sequence being 1?
The reason you're seeing This sequence number has already passed is you've set sequence=0 in your transaction. (provided by Result from 'submit' call :)

On a side note, I see you've set currency='USD' which means you have to open a trust line first. your account currently has 0 account_lines

Either way, good luck using XRP ;)