Remove unwanted attributes of Product - sap-commerce-cloud

Question

i create Item Type Books with following attribute title,author,publishingAttribute,isAvailable
all are String except isAvailable this is boolean there is no extend the any class but when i run select from HAC it show extra attribute i want to remove this attribute i can how i can delete it.
This is my item type
[<itemtype generate="false" code="Books" autocreate="true">
<deployment table="Books" typecode="20000" />
<attributes>
<attribute qualifier="title" type="java.lang.String">
<description>Book Title</description>
<modifiers initial="true"/>
<persistence type="property"/>
</attribute>
<attribute qualifier="author" type="java.lang.String">
<description>>Book Author Name</description>
<persistence type="property"/>
</attribute>
<attribute qualifier="publishingAttribute" type="java.lang.String">
<description>>Book Author Attribute</description>
<persistence type="property"/>
</attribute>
<attribute qualifier="isAvailable" type="java.lang.Boolean">
<description>Available or not </description>
<persistence type="property"/>enter image description here
</attribute>
</attributes>
</itemtype>][1]

Answer 1

Look at the following itemtype definitions available in core-items.xml:
<itemtype code="Item"
extends=""
jaloclass="de.hybris.platform.jalo.Item"
deployment="de.hybris.platform.persistence.Item"
autocreate="true"
generate="false"
abstract="true">
<attributes>
<attribute autocreate="true" qualifier="creationtime" type="java.util.Date">
<persistence type="cmp" qualifier="creationTimestampInternal"/>
<modifiers read="true" write="false" search="true" optional="true" initial="true"/>
</attribute>
<attribute autocreate="true" qualifier="modifiedtime" type="java.util.Date">
<persistence type="cmp" qualifier="modifiedTimestampInternal"/>
<modifiers read="true" write="true" search="true" optional="true"/>
</attribute>
<attribute autocreate="true" qualifier="itemtype" type="ComposedType">
<persistence type="cmp" qualifier="typePkString"/>
<modifiers read="true" write="true" search="true" optional="true"/>
</attribute>
<attribute autocreate="true" qualifier="owner" type="Item">
<persistence type="cmp" qualifier="ownerPkString"/>
<modifiers read="true" write="false" search="true" optional="true" private="false" initial="true"/>
</attribute>
<attribute autocreate="true" qualifier="pk" type="de.hybris.platform.core.PK">
<persistence type="cmp" qualifier="pkString"/>
<modifiers read="true" write="false" search="true" optional="false"/>
</attribute>
<attribute autocreate="true" qualifier="sealed" type="boolean">
<persistence type="property" qualifier="sealed"/>
<modifiers read="true" write="false" search="true" optional="true"/>
</attribute>
</attributes>
</itemtype>
<itemtype code="ExtensibleItem"
extends="Item"
jaloclass="de.hybris.platform.jalo.ExtensibleItem"
deployment="de.hybris.platform.persistence.ExtensibleItem"
autocreate="true"
generate="false" abstract="true">
</itemtype>
<itemtype code="LocalizableItem"
extends="ExtensibleItem"
jaloclass="de.hybris.platform.jalo.c2l.LocalizableItem"
deployment="de.hybris.platform.persistence.c2l.LocalizableItem"
autocreate="true"
generate="false" abstract="true">
</itemtype>
<itemtype code="GenericItem"
extends="LocalizableItem"
jaloclass="de.hybris.platform.jalo.GenericItem"
deployment="de.hybris.platform.persistence.GenericItem"
autocreate="true"
generate="false">
</itemtype
As you can see, GenericItem extends LocalizableItem, LocalizableItem extends ExtensibleItem, and ExtensibleItem extends Item i.e. GenericItem ▸ LocalizableItem ▸ ExtensibleItem ▸ Item. It means that GenericItem inherits 6 attributes, creationtime, modifiedtime, itemtype, owner, pk, and sealed from Item.
When you create an itemtype without extending another itemtype, it extends GenericItem by default and therefore you will see all these 6 inherited attributes (creationtime, modifiedtime, itemtype, owner, pk, and sealed) in that itemtype.
For example, the following Flexible Search query will return these 6 inherited attributes (creationtime, modifiedtime, itemtype, owner, pk, and sealed) along with the attributes you have declared in your itemtype definition:
SELECT * FROM {Books}