In BAPI's why the structures are used in table parameters?

Hello sir,
what is BAPI sir? In BAPI's why the structures are used in table parameters? table parameters they are using structures but not using any customized tables ?
regards
rachu.

Hello Rachu
BAPIs provide RFC-enabled interfaces to SAP business objects (e.g. like customer, sales order, purchase order, etc.).
A BAPI does basically the same like you would need to do calling the corresponding transaction (e.g. BAPI_SALESORDER_CREATE -> VA01).
Since they are RFC-enabled they can be called from external systems.
BAPIs represent an external interface for the outside world. Very often you will find within the BAPI that there is a mapping done to the (SAP-)internal structures at the beginning of the coding and vice versa at the end of the coding. Thus, you will (almost) never find any DB table name used as type of a BAPI TABLES parameter.
Regards
Uwe

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<?xml version="1.0"?>
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"-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN"
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<enterprise-beans>
<entity>
<ejb-name>CategoryEJB</ejb-name>
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<local>com.CategoryLocal</local>
<ejb-class>com.CategoryBean</ejb-class>
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<cmp-version>2.x</cmp-version>
<abstract-schema-name>Category</abstract-schema-name>
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<cmp-field><field-name>categoryName</field-name></cmp-field>
<cmp-field><field-name>picture</field-name></cmp-field>
<cmp-field><field-name>pictureWidth</field-name></cmp-field>
<cmp-field><field-name>pictureHeight</field-name></cmp-field>
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<local>com.ProductLocal</local>
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<persistence-type>Container</persistence-type>
<prim-key-class>java.lang.Integer</prim-key-class>
<reentrant>False</reentrant>
<cmp-version>2.x</cmp-version>
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<cmp-field><field-name>productDescription</field-name></cmp-field>
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<cmp-field><field-name>category</field-name></cmp-field>
<primkey-field>productId</primkey-field>
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<security-role>
<role-name>Employees</role-name>
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<role-name>Employees</role-name>
<method>
<ejb-name>CategoryEJB</ejb-name>
<method-name>*</method-name>
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</method-permission>
<container-transaction>
<method>
<ejb-name>CategoryEJB</ejb-name>
<method-name>*</method-name>
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<ejb-name>ProductEJB</ejb-name>
<method-name>*</method-name>
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<trans-attribute>Required</trans-attribute>
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<!DOCTYPE weblogic-rdbms-jar PUBLIC
'-//BEA Systems, Inc.//DTD WebLogic 8.1.0 EJB RDBMS Persistence//EN'
'http://www.bea.com/servers/wls810/dtd/weblogic-rdbms20-persistence-810.dtd'>
<weblogic-rdbms-jar>
<weblogic-rdbms-bean>
     <ejb-name>CategoryEJB</ejb-name>
<data-source-name>ShoeStore</data-source-name>
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          <table-name>category</table-name>
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          <field-map>
          <cmp-field>categoryName</cmp-field>
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          <field-map>
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          <field-map>
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<automatic-key-generation>
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</weblogic-rdbms-bean>
<weblogic-rdbms-bean>
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<data-source-name>ShoeStore</data-source-name>
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          <dbms-column>productId</dbms-column>
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          <field-map>
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          <dbms-column>brandName</dbms-column>
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          <field-map>
          <cmp-field>productDescription</cmp-field>
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          </field-map>
          <field-map>
          <cmp-field>purchasePrice</cmp-field>
          <dbms-column>purchasePrice</dbms-column>
          </field-map>
          <field-map>
          <cmp-field>category</cmp-field>
          <dbms-column>categoryId</dbms-column>
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</table-map>
     
<automatic-key-generation>
<generator-type>SQL_SERVER</generator-type>
</automatic-key-generation>
</weblogic-rdbms-bean>
<weblogic-rdbms-relation>
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<weblogic-relationship-role>
<relationship-role-name>Product-belongs-to-Category</relationship-role-name>
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<column-map>
<foreign-key-column>categoryId</foreign-key-column>
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</weblogic-rdbms-relation>
</weblogic-rdbms-jar>
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package com;
import javax.ejb.CreateException;
import javax.naming.NamingException;
import java.util.Date;
import java.util.Vector;
import java.util.Collection;
public interface ProductLocal extends javax.ejb.EJBLocalObject
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     public void setProductId(Integer productId);
     public String getBrandName();
     public void setBrandName(String brandName);
     public String getProductDescription();
     public void setProductDescription(String productDescription);
     public Double getPurchasePrice();
     public void setPurchasePrice(Double purchasePrice);
public CategoryLocal getCategory();
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Here is my ProductBean.java:
package com;
import javax.naming.InitialContext;
import javax.ejb.EntityContext;
import javax.ejb.CreateException;
import javax.naming.NamingException;
import java.util.Date;
import java.util.Collection;
import java.util.Iterator;
import java.util.Vector;
import java.lang.Integer;
public abstract class ProductBean implements javax.ejb.EntityBean
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          this.setProductId(id);
          return null;
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//     public abstract void setCategoryId(Integer categoryId);
     public abstract CategoryLocal getCategory();
     public abstract void setCategory(CategoryLocal category);
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     public abstract void setProductId(Integer productId);
     public abstract String getBrandName();
     public abstract void setBrandName(String brandName);
     public abstract String getProductDescription();
     public abstract void setProductDescription(String productDescription);
     public abstract Double getPurchasePrice();
     public abstract void setPurchasePrice(Double purchasePrice);
     public void setEntityContext(EntityContext ec)
          System.out.println("ProductBean setEntityContext");
     public void unsetEntityContext()
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     public void ejbLoad()
          System.out.println("ProductBean ejbLoad");
     public void ejbStore()
          System.out.println("ProductBean ejbStore");
     public void ejbActivate()
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     public void ejbPassivate()
          System.out.println("ProductBean ejbPassivate");
     public void ejbRemove()
          System.out.println("ProductBean ejbRemove");
What do I needed to do to fix this problem.
Any hint or help would be greatly appreciated!!!
Yours,
Frustrated

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