Hi John

you have record buffering on childs tables;
when you revert master table, record pointer on master table is changed
and relations do a implicit tableupdate on childs tables

WITH THISFORM.oCurrentData
llReturnValue = TABLEREVERT(.F., ._cAlias) && <--- this change RECNO() -> move childs
IF NOT llReturnValue = 0
TABLEREVERT(.F., "LAB_PHYSICAL")
TABLEREVERT(.F., "LAB_VISUAL")
TABLEREVERT(.F., "LAB_MECHANICAL")
TABLEREVERT(.F., "LAB_COMP")
TABLEREVERT(.F., "LAB_TREATMENT")
TABLEREVERT(.F., "LAB_RUNNING")
ENDIF

Exist a general rule:
To revert a composite operation, revert all single build composite operation on build order reverted.

 WITH THISFORM.oCurrentData
IF MIN(	TABLEREVERT(.F., "LAB_RUNNING")	;
	, TABLEREVERT(.F., "LAB_TREATMENT")	;
	, TABLEREVERT(.F., "LAB_COMP")		;
	, TABLEREVERT(.F., "LAB_MECHANICAL")	;
	, TABLEREVERT(.F., "LAB_VISUAL")	;
	, TABLEREVERT(.F., "LAB_PHYSICAL")	;
	, TABLEREVERT(.F., ._cAlias))=0
    * error
ENDIF

Fabio