Terry,
It’s not repeating the validation code. In the beginning of the validation code, I added

WAIT “In ValidateCurrentRow” WINDOW

After changing the row, wait window is appearing only once. Even the validation code is as Straightforward as this –

SELECT tmp_gl
IF REMOVE = "Y"
	RETURN(.T.)
ENDIF

IF EMPTY(GL_CODE) OR EMPTY(DOC_NO) OR EMPTY(REMARKS) OR EMPTY(AMOUNT)
	THIS.pcErrMsg = "Enter all columns correctly."
	RETURN(.F.)
ENDIF

IF !SEEK(GL_CODE, 'gl_mast')
	THIS.pcErrMsg = "GL Code not found in GL Master."
	RETURN(.F.)
ENDIF

IF ASCAN(gArrControlAccounts, GL_CODE) != 0
	THIS.pcErrMsg = "Control Account not allowed here."
	RETURN(.F.)
ENDIF