Jeremy Corbyn has lost the latest battle in a power struggle over appointments to Labour's ruling body.
A fresh attempt by the leader's allies to stop the party's Scottish and Welsh leaders or their representatives sitting on the National Executive Council (NEC) was rejected when it met on Monday morning.
It followed a "powerful address" by Welsh leader Carwyn Jones urging the committee not to let Wales down.
The First Minister is understood to have told the NEC that the party in Wales is the most successful part of the Labour family but nationalists claim it is little more than a "branch" office.
He is said to have told NEC members that the measures were needed to counter those claims as he urged them not to "water down" the package of reforms.
The NEC knocked back the bid to delay the changes without a vote, with members being told the issue had been backed twice at previous meetings.
Proposals will now go before the wider party through a vote on the conference floor on Tuesday.
Scottish Labour leader Kezia Dugdale told BBC Scotland: "Exactly what we agreed yesterday is exactly what is happening tomorrow in a vote on the conference floor.
"We have been working on these proposals for a long time. It is the right thing for Scotland and the right thing for the whole party and I am looking forward to the debate tomorrow.
"The proposals are very clear that the position on the NEC is for the leader of the Scottish and Welsh parties to either take themselves or to nominate, just as Jeremy Corbyn nominates the people that sit on the shadow cabinet that sit in the NEC."
A separate attempt to thwart the reforms, which Mr Corbyn's allies fear swings the balance against him on the NEC, was also rejected on the floor of the conference hall.
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