Not exactly sure what you mean by this, but it may be reasonable to assume you tried to null out the cell value before entering a new value and had some issues. Here are some past forum posts and bug numbers (all marked as fixed) related to this sort of issue:
trying to modify some data in the data tab of a table, very often the edited field contains a blank char (not visible)
Perhaps there is something specific about your installation environment/configuration or input procedures that may be the cause?
INSERT INTO "SCOTT"."DEPT" (DEPTNO, DNAME, LOC) VALUES (' -99 ', 'OOPS', 'xxx') Commit Successful UPDATE "SCOTT"."EMP" SET HIREDATE = TO_DATE(' 01-JAN-12 ', 'DD-MON-RR') WHERE ROWID = 'AAASHjAAEAAAACXAAP' AND ORA_ROWSCN = '39136431' Commit Successful
RaptoGridTable.processKeyBinding(pressed F2 WHEN_FOCUSED) returning processed=false from actionKeyFilter RaptoGridTable.processKeyBinding(pressed F2 WHEN_ANCESTOR_OF_FOCUSED_COMPONENT) returning processed=true from local RaptoGridTable.processKeyBinding(released F2 WHEN_ANCESTOR_OF_FOCUSED_COMPONENT) returning processed=false from actionKeyFilter RaptoGridTable.processKeyBinding(released BACK_SPACE WHEN_ANCESTOR_OF_FOCUSED_COMPONENT) returning processed=false from super
which I assume is an attempt to trap some of these issues.
RaptoGridTable.processKeyBinding(typed ☺ WHEN_FOCUSED) returning processed=false from super RaptoGridTable.processKeyBinding(typed ☺ WHEN_ANCESTOR_OF_FOCUSED_COMPONENT) returning processed=false from super