Create Pop-up window in Web Dynpro Java

Create Pop-up window in Web Dynpro Java.

IWDWindowInfo winInfo =
(IWDWindowInfo) wdComponentAPI.getComponentInfo().findInWindows("Window");
IWDWindow window = wdComponentAPI.getWindowManager().createModalWindow(winInfo);
window.setTitle("Title");
window.show();

Error: The generator table >>TMP_SEQUENCE<< does not exist

Problem:
The generator table >>TMP_SEQUENCE<< does not exist.

Situation:
I have had this error on SAP Enterprise Portal 7.3 when I tried to create entity for table.

Solutin:
You should create table TMP_SEQUENCE with fields:
GEN_KEY (VARCHAR(128), primary key)
GEN_VALUE (BIGINT or INTEGER)