I would like restore a database in Incarnation

hello,

        I executed etape 1 next but the number of my sequence is too high. until 18 but I should retrieved until the sequence 17.
Now I cannot retrieve the backup of my database, because my old backup is in incarnation.

>>> does it exists an possibility to retrieve my old database ?

best regards

JP

list incarnation;

78694   78710   WT10TST1 1531722894       PARENT  1          17-SEP-11
78694   78695   WT10TST1 1531722894       PARENT  995548     22-NOV-12
78694   79404   WT10TST1 1531722894       CURRENT 1288612    27-NOV-12

Etape 1

Restorer le controlfile
set ORACLE_SID=WT10TST1

rman target / rcvcat rman/rman001@RCAT11

set DBID="1531722894";

startup nomount;
run {

2> allocate channel ch00 type 'SBT_TAPE';

3> restore controlfile from tag=TAG20121126T170400;

4> release channel ch00;