rspierenburg:
What you might try is:
1. Select the drawing, open its dialog box and under Frame select Fit Frame to drawing. This will set the drawing size to the drawing's content in its original location.
2. Now drag the drawing to its proper location on the Layout.
3. Again, open the drawing's dialog box and under Properties, set an appropriate anchor point, so the drawing will expand/contract correctly if the extents of its contents is changed.
You should add a Signature to your Profile (click the Profile button near the top of this page) with your ArchiCAD version and operating system (see mine for an example) for more accurate help in this forum.
HTH,
David