When I modify a bones position with key I and LocRot option, the selected keyframe is ok but the previous keyframe bones is also modified !

does it really change the previous keyframe?

or didn't you set an initial keyframe?
_________________
I'm sitting, waiting, wishing, building Blender in superstition...

CoDEmanX wrote:

does it really change the previous keyframe? or didn't you set an initial keyframe?

There are 2 keyframes and when I modify the second using the key I and
LocRot the 2 keyframes are modified : the key I should erase the current one and not the 2 keyframes in the same time .

you need to select the pose bones before inserting a keyframe, maybe thats the problem?
_________________
I'm sitting, waiting, wishing, building Blender in superstition...

CoDEmanX wrote:

you need to select the pose bones before inserting a keyframe, maybe thats the problem?

Of course, I did it : I select the armature of the bone in pose-mode then I change its position and finally I press the key I and choose LocRot;
But I have noticed that it happend on the last keyframe when it is current .
(the previous one is unfortunately modified too even unselected)