Leica D-LUX 109 Instructions Manual page 134

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Only AF Lock is effective when taking pictures in [Manual Exposure] Mode
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Only AE Lock is effective when taking pictures with Manual Focus.
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Only AF Lock is active during motion picture recording. Once you cancel AF Lock during the
recording, it cannot be reactivated.
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The subject can be focused again by pressing the shutter button halfway, even when AE is locked.
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Program Shift can be set even when AE is locked.
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Lock is canceled when the focal length is changed after locking the exposure and/or focus.
Perform the locking operation again.
134
Focus and Exposure Settings
Focus and Exposure Memory Lock