Service business process oracle.apps.fnd.framework.OAException: java.lang.NullPointerException

We are trying to update a service business process and get following error:

Error Page

Exception Details.

oracle.apps.fnd.framework.OAException: java.lang.NullPointerException at oracle.apps.fnd.framework.OAException.wrapperException(OAException.java:912) at oracle.apps.fnd.framework.OAException.wrapperException(OAException.java:886) at oracle.apps.fnd.framework.OAException.wrapperInvocationTargetException(OAException.java:1009) at oracle.apps.fnd.framework.server.OAUtility.invokeMethod(Unknown Source) at oracle.apps.fnd.framework.server.OAUtility.invokeMethod(Unknown Source) at oracle.apps.fnd.framework.server.OAApplicationModuleImpl.invokeMethod(OAApplicationModuleImpl.java:775) at oracle.apps.cs.charges.setups.busprocess.webui.CsSrBPDefinitionCO.processFormRequest(CsSrBPDefinitionCO.java:268) at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processFormRequest(OAWebBeanHelper.java:854) at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processFormRequest(OAWebBeanContainerHelper.java:385) at oracle.apps.fnd.framework.webui.OAPageLayoutHelper.processFormRequest(OAPageLayoutHelper.java:1241) at oracle.apps.fnd.framework.webui.beans.layout.OAPageLayoutBean.processFormRequest(Unknown Source) at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processFormRequestChildren(OAWebBeanHelper.java:1066) at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processFormRequestChildren(OAWebBeanHelper.java:1032) at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processFormRequest(OAWebBeanHelper.java:887) at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processFormRequest(OAWebBeanContainerHelper.java:385) at oracle.apps.fnd.framework.webui.beans.form.OAFormBean.processFormRequest(Unknown Source) at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processFormRequestChildren(OAWebBeanHelper.java:1066) at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processFormRequestChildren(OAWebBeanHelper.java:1032) at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processFormRequest(OAWebBeanHelper.java:887) at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processFormRequest(OAWebBeanContainerHelper.java:385) at oracle.apps.fnd.framework.webui.beans.OABodyBean.processFormRequest(OABodyBean.java:363) at oracle.apps.fnd.framework.webui.OAPageBean.processFormRequest(OAPageBean.java:3121) at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:1903) at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:558) at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:446) at _pages.__oa._jspService(__oa.java:233) at weblogic.servlet.jsp.JspBase.service(JspBase.java:34)