Post detail/child with REST API

Hello,

I'm struggling to POST a new register with the REST API.

I tried with my SPE class, representation and Tables.

Also tried with SHIPMENT, wich have edit facet.

If I set it with no collections, it creates the header, but if I try to create with lines, it answer Mandatory link or No lines where introduced

{
    "BPRNUM""",
    "SHHSHD": [
        {
            "CTRLIN"1000,
            "CTRNUM""CTR1603-00000015",
            "POHNUM""POFR0110077",
            "POPLIN"1000,
            "POQSEQ"1,
            "SHIPLIN"1000
        },
        {
            "CTRLIN"2000,
            "CTRNUM""CTR1603-00000015",
            "POHNUM""POFR0110077",
            "POPLIN"2000,
            "POQSEQ"1,
            "SHIPLIN"2000
        }
    ],
    "SHIPNUM""SHP1603-00000020"
}

 Thanks