Too-long PIU: Transmission was truncated by a receiving node because the PIU exceeded a maximum length or sufficient buffering was not available.
VTAM® hint: A possible cause of this error is that a session ended unexpectedly and either no message is received or an exception request (EXR) is generated with this sense code. When an application receives an exception request or response with this sense code, it usually ends the session. No VTAM message is issued, but the application might issue a message. This can occur when a path information unit (PIU) is too large to be passed from one node to another. See the information about common subarea network problems in the z/OS Communications Server: SNA Diagnosis Vol 1, Techniques and Procedures for more information about this problem or see APAR II03990.