problem with dump shaper part

hello
when switching betw 2 parts, then switching back to Part_1, then
Menu - Part - Dump
I get the following message from Salome:
"""
Dump cannot be done. Please move the history line to the end before dumping.
"""
and the dump is not written.
What is the "history line"? And how to resolf this?
thank you, kathi
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