Collision at target location. Operation not performed

What causes this issue?

When moving or copying a block consisting of one or more elements, the
target block must be the same size as the selected block and empty.
If the block contains elements with the attribute "Permanently visible
possible entries pushbutton", there must be enough space in the target
area to display the possible entries icon. At the same time, you should
ensure that there is sufficient space for the possible entries icons of
other elements.
In this case, there is not enough space, or the right or lower edge has
been exceeded.

How to fix this error?

Place the cursor so that the target position is blank. If this is not
possible, you can cut the selected block and paste it into another
screen. You can leave the select mode with F3, even if no block was
moved or copied.

Error message extract from SAP system. Copyright SAP SE.