Add group of text fields but show only one group field which has data in Jasper - jasper-reports

Question

I have two groups text fields.
1st group (Stock Code) is :
$F{VW_STOCKOPNAME_S1_KL}
$F{VW_STOCKOPNAME_S2_JB}
$F{VW_STOCKOPNAME_S3_NB}
$F{VW_STOCKOPNAME_S4_SB}
2nd group (Asset Code) is :
$F{VW_STOCKOPNAME_A1_GOLONGAN}
$F{VW_STOCKOPNAME_A2_BIDANG}
$F{VW_STOCKOPNAME_A3_KELOMPOK}
$F{VW_STOCKOPNAME_A4_SUBKELOMPOK}
$F{VW_STOCKOPNAME_A5_SUBSUBKEL}
and I have field called Product :
$F{VW_STOCKOPNAME_PRODUCT}
Each product has either Asset Code / Stock Code.
If a product has Asset Code, then Stock Code field is automatically blank,
it works the other way around.
Code || Product
----------------------
1-2-1-1 || Stock Goods
0-2-3-1 || Asset Goods
How can I make it automatically show each product with matching code?

Answer 1

for all the textfields in group add property "Blank When Null"(isBlankWhenNull="true")
update: Added PrintWhenExpression
<textField isStretchWithOverflow="true" isBlankWhenNull="true">
<reportElement x="143" y="29" width="260" height="20" isRemoveLineWhenBlank="true">
<printWhenExpression><![CDATA[($F{VW_STOCKOPNAME_S1_KL}!=null && $F{VW_STOCKOPNAME_S2_JB}!=null && $F{VW_STOCKOPNAME_S3_NB}!=null && $F{VW_STOCKOPNAME_S4_SB}!=null)]]></printWhenExpression>
</reportElement>
<box leftPadding="2"/>
<textElement verticalAlignment="Middle">
<font isBold="true"/>
</textElement>
<textFieldExpression class="java.lang.String"><![CDATA[$F{VW_STOCKOPNAME_S1_KL}]]></textFieldExpression>
or you can also use print when expression