i have converted my code :

i placed code as below
in load event :

cursorsetprop("buffering",5,'inward')
cursorsetprop("buffering",5,'inward1')

in "ADD" command button

sele inward

** single records in this parent table, but i am using table buffering because if my record pointer move to next records it update the record to table so i am not using row buffering.

appe blank
repl reco1 with str(recno)+str(seconds(),10,3) && Records no -1
go recno()
sele inward1  && multiple records in this child table.
appe blank
repl reco1 with inward.reco1
go recno()

in "SAVE" command button

sele inward
tableupdate(.f.,.t.) && single record
sele inward1
tableupdate(.t.,.t.) && Multi records

after saving first invoice, if i add one more invoice by cliking on "ADD" button

sele inward
appe blank
repl reco1 with str(recno)+str(seconds(),10,3)   && Records no -2

it is showing me record no -2, but after tableupdate(.f.,.t.) it should be -1

should i use like :

sele inward
tableupdate(.t.,.t.) 

warm regards,
mk.