The red "U" nearby the address signifies the address itself has unconfirmed Tx, which has been used to create another Tx. So, unless those unconfirmed Tx are confirmed, the next Tx can not be confirmed.
thanx a lot sir ! that's now super clear
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{
"hex": "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",
"txid": "11a2f3062003bf7f3e6ffef7b03c27f654ad532506d0ae2f4a68d8cdc0e1e9f6",
"hash": "11a2f3062003bf7f3e6ffef7b03c27f654ad532506d0ae2f4a68d8cdc0e1e9f6",
"size": 257,
"vsize": 257,
"version": 1,
"locktime": 0,
"vin": [
{
"txid": "9b8fd1854bb37642648b85dec6b5c2f3b2b7f3bb06c511875f7b84d6e2ae6f29",
"vout": 0,
"scriptSig": {
"asm": "304402202b4480b6af818bd7020e64d4038cbb6e083c2ae7380896f9f1fbbbf9e633af1d022038fd407bf634d07dde4a526eb6f2909fbb2fe71e9b8ea629104276a5e05ca75a[ALL] 0421e8d3ad0871e7af1d994c7d9ba0fad053ba2373857cd2167e5e6fb6079bbd7a8d223840cc62c34bb598e91e3ce7844fa6e2622b9161a0014f02cfb3e00703e9",
"hex": "47304402202b4480b6af818bd7020e64d4038cbb6e083c2ae7380896f9f1fbbbf9e633af1d022038fd407bf634d07dde4a526eb6f2909fbb2fe71e9b8ea629104276a5e05ca75a01410421e8d3ad0871e7af1d994c7d9ba0fad053ba2373857cd2167e5e6fb6079bbd7a8d223840cc62c34bb598e91e3ce7844fa6e2622b9161a0014f02cfb3e00703e9"
},
"sequence": 4294967295
}
],
"vout": [
{
"value": 0.00247100,
"n": 0,
"scriptPubKey": {
"asm": "OP_DUP OP_HASH160 72543c749b27ae028b2ba692d11f49f6b02243ae OP_EQUALVERIFY OP_CHECKSIG",
"hex": "76a91472543c749b27ae028b2ba692d11f49f6b02243ae88ac",
"reqSigs": 1,
"type": "pubkeyhash",
"addresses": [
"1BRWwhZMd9M1Jh7jZsZdhv3xExgs6YvtQ5"
]
}
},
{
"value": 0.00620000,
"n": 1,
"scriptPubKey": {
"asm": "OP_DUP OP_HASH160 c9990b01255b501385d2328ce2b4e1b3f5ccfead OP_EQUALVERIFY OP_CHECKSIG",
"hex": "76a914c9990b01255b501385d2328ce2b4e1b3f5ccfead88ac",
"reqSigs": 1,
"type": "pubkeyhash",
"addresses": [
"1KNxAAvJccnHxRK3J8tJ2pEzBrdaGKfinu"
]
}
}
],
"blockhash": "000000000000000000bf344eaff88ea80c744b0de3fe60965ddfe7b9d978b518",
"confirmations": 2,
"time": 1486043492,
"blocktime": 1486043492
}