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can someone tell me why suddenly i can not replace a record in an file , like this ,not work - replace mark with markreplace-

put some code - is it exclusibe mode or share mode? what's the error?

I think this is what your asking.
I found at times if I use a msgbox or msginfo while on a record right after I have to use command with table name in it.
replace table->mark with marketplace.
If mark is a variable you can not use replace. Use equals.
mark := table->marketplace or mark := marketplace.

You can use such a statement

the problem is at the end of the file after BEGIN SEQUENCE WITH {|o| break(o)} , I place it at the beginning of the work
the append blank working don working the Replace

For i=1 TO Len( hResponse )

Select 2
seek hResponse["invoiceMark"]
if found()
msgbox('Υπάρχει ο Mark')
replace MarkReques with hResponse["invoiceMark"]
skip
else
msgbox('Δέν υπάρχει o Mark',hResponse["invoiceMark"] )
append blank
2-> MARKREQUES := hResponse["invoiceMark"]
replace u_id with hResponse["invoiceUid"]
COMMIT

EndIf
Next i

Try to comment Begin sequence - you will see immediately what is the source of error.
Did you set EXCLUSIVE to .T.?
You don't use record locking in this code

IF 2 IS USED SHARED I WOULD

For i=1 TO Len( hResponse )

Select 2
seek hResponse["invoiceMark"]
if found()
msgbox('Υπάρχει ο Mark') //Franco I have trouble here so i RESELECT TABLE AFTER MSGBOX
SELECT 2
IF RLOCK()
replace MarkReques with hResponse["invoiceMark"]
UNLOCK
ENDIF
skip
else
msgbox('Δέν υπάρχει o Mark',hResponse["invoiceMark"] )
SELECT 2
append blank //FRANCO APPEND BLANK LOCKS RECORD
**** 2-> MARKREQUES := hResponse["invoiceMark"]
REPLACE MARKREQUES WITH hResponse["invoiceMark"]
replace u_id with hResponse["invoiceUid"]
UNLOCK
COMMIT

EndIf
SELECT hResponce
Next i

the problem is for - next
Without for - next the record replaces
I do not understand

Look at above sample
I added select the first file before the next
I think I would use a do while loop instead of for next
SELECT FILE1
GO TOP
DO WHILE ! EOF()
SELECT FILE1
HRESPONCE
SELECT FILE2
AND SO ON
SELECT FILE1
SKIP
LOOP
ENDDO

It did not work
The problem is in the for next
If I put it for 1 to 2 then it is ok


Select 2

For i=1 TO 2

Replace MARKREQUES with 'samone'
replace u_id with kalavrita'
COMMIT

Next i