SAP, ServiceNow, and Salesforce Cloud Service Consulting Company | LMTEQ

Streamlining Billing Approvals in SAP S/4 HANA – A Frontend Transformation


Our client – a Fortune 500 company renowned for business transformation, together with the LMTEQ’s team started a project to enhance their billing approval process within SAP S/4 HANA software. The overarching goal was to empower billing managers with a sophisticated, user-friendly interface, reducing dependencies on SAP GUI for approval actions. This case study delves into the pain points faced during the project, how our team implemented an iron-clad strategy to overcome them, and finally the impactful results achieved.


The overall objective of the project was to Streamline the billing approval process by integrating a New Angular-based frontend into the SAP S/4 HANA billing application. This aimed to provide billing managers with a more intuitive interface for approval and rejection actions, Eliminating the need for SAP GUI login credentials and lastly automating the approval and sending mail process using SAP workflows.

Challenges and Pain Points

  • Custom Frontend Deviation

Introducing a custom Angular-based frontend deviating from the standard SAP inbox posed technical challenges. The shift required thorough workflow reevaluation, demanding in-depth research and development for seamless integration with SAP S/4 HANA.

  • Coordination Across Development Layers

Effective coordination between frontend and ABAP development, along with functional support, became a critical challenge. Aligning Angular-based front end with ABAP back-end logic required synchronized efforts and a deep understanding of both domains.

  • Defining and Implementing Custom Logic

Refactoring HANA models and objects without disrupting the existing production logic posed a delicate challenge to the team.

  • Time Constraints

The challenge of time constraints added complexity, requiring our team to balance swift yet precise development and implementation to meet deadlines in a complex SAP environment.

  • Communication Challenges

Effective communication within our team and with stakeholders posed a challenge, requiring robust channels for coordinating efforts, sharing technical insights, and fostering a unified understanding of the custom approach.

Overcoming Challenges

  • Systematic Task Assignment

To address frontend challenges, the team systematically assigned tasks, ensuring focused development efforts and clear responsibilities for integrating the Angular frontend with SAP S/4 HANA.

  • Regular Communication and Issue Resolution

Effective coordination between frontend and ABAP development, along with functional support, became a critical challenge. Aligning Angular-based front end with ABAP back-end logic required synchronized efforts and a deep understanding of both domains.

  • Peer Reviews for Technical Validation

After each task, the team conducted rigorous peer reviews to identify areas for improvement, ensuring adherence to SAP’s guidelines and maintaining consistency across the solution.

  • Regression Testing for SAP Inbox Functionality

For seamless integration and SAP inbox adherence, the team rigorously conducted regression testing to validate custom logic, ensuring it didn’t compromise existing workflows and approval mechanisms, and safeguarding solution integrity.

  • Task-Specific Regression Testing for Logics

The team conducted task-specific regression testing, focusing on intricate logic within the billing application to ensure accurate functionality, providing granular validation of the technical aspects alongside general regression testing.


The implementation resulted in a significant improvement in efficiency and user experience. Billing managers can now access the approval inbox tab within the billing application, eliminating the need for SAP GUI and reducing approval time by 25%.

The new interface enables managers to enter approval or rejection comments directly, and automated SAP emails with reasons enhance communication. Mass approval or rejection options save approximately 30% of managers’ time, and the ability to forward items or select substitute approvers adds further flexibility.

  • Reducing approval time by 25%. 

  • Save approximately 30% of managers' time

  • Automated SAP emails with reasons enhance communication


Key OData services facilitated seamless integration between SAP S/4 HANA and the Angular-based web app, efficiently handling approval dashboard listings and actions. Leveraging ODATA data provider extension classes ensured real-time data sync, standardized secure data interaction, and contributed to overall integration robustness, enabling a smooth user experience.


The successful transformation of the billing approval process is exemplified by our team’s commitment to optimizing SAP S/4 HANA functionalities. By overcoming challenges through systematic task assignments, peer reviews, regular communication, and regression testing, our team has delivered a streamlined interface that increases users’ productivity and overall efficiency. The seamless integration of Angular-based frontend with SAP S/4 HANA ensures that the managers have an intuitive interface for performing various billing functions, marking a milestone in improving billing workflow for the client.

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