What is the secondary development of oa system software?

Take Yubo OA office software as an example. The secondary development of OA office system is based on the OA system according to the individual needs of users. Generally, OA developers carry out secondary development on the basis of their own products, which requires OA products to have strong expansibility. The secondary development team of OA needs to have a deep understanding of OA products and have certain technical strength and project experience. From this aspect, there are certain defects in the secondary development of OA agents.