Updating saved LBO image

Hi All!
I am facing a problem when updating an SUPBigBinary image in an LBO.
When I initially create the object in the LBO, the image is saved correctly and updated correctly,.. however, If I later wish to update the image with another image, it seems it is restricted to the original NSData length.
The new image saved is only visible halv-way.
Example:
To the left: Image taken with iPad, low-res
To the right: Larger image of a car
Notice the gray bottom of the right image.
Even worst, if I do not save an image just after I create the LBO item,... no image will be saved. The updating just seems to ignore the length.
My code:
WCR_LBO *wcr = [WCR_LBO getInstance];
[wcr setCOMPONENT_DESCR:[self getValueForRow:kTitleComponentDescription]];
[wcr setCUSTOMER_PRICE:[NSNumber numberWithFloat:[costString floatValue]]];//11
[wcr setCUSTOMER_ID:self.customerId.KUNNR];
if (self.viewMode == kWcrViewModeAdding)
    [wcr setCREATION_DATE:[NSDate date]];
    [wcr setWCR_LBO_ID:[NSString stringWithFormat:@"%i", [MHCDashboardUtil getAndSetNextDashboardLboId]]];
    [wcr create];
if (self.imageView.image)
    NSData *img1 = [UIImageJPEGRepresentation(self.imageView.image, 1) copy];
    SUPBigBinary *bbImg1 = wcr.PICTURE;
    [bbImg1 openForWrite:img1.length];
    [bbImg1 write:img1];
    [bbImg1 close];
    [wcr setPICTURE:bbImg1];
    [wcr save];
I have also tried it with setting openForWrite: to 0, same result.
What am I doing wrong?
Best regards,
Paul Peelen

I don't know how a mini behaves, but my 20G 4th gnereation iPod goes back to the update/reatore screen when it's finished.

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