重量和平衡报告需要提供质量特性的控制和管理，并确保质量特性变化最小。DID DI-SESS-81234B包含合同中描述的特定和离散任务要求生成的数据产品的格式和内容准备说明。

Weight and Balance Reports are required to provide for control and management of mass characteristics and to ensure minimal mass properties variations.DID DI-SESS-81234B contains the format and content preparation instructions for the data product generated by the specific and discrete task requirement as delineated in the contract.