Section: 8.7.2 Conditional IE errors
Content: When the MS upon receipt of an RR, MM or CC message diagnoses a "missing conditional IE" error or an "unexpected conditional IE" error or when it receives an RR, MM or CC message containing at least one syntactically incorrect conditional IE, it shall ignore the message except for the fact that, if an RR connection exists, it shall return a status message (STATUS, or MM STATUS depending on the PD) with cause value # 100 "conditional IE error". When the MS upon receipt of a GMM or SM message diagnoses a "missing conditional IE" error or an "unexpected conditional IE" error or when it receives a GMM or SM message containing at least one syntactically incorrect conditional IE, it shall ignore the message and it shall return a status message (GMM STATUS or SM STATUS depending on the PD) with cause value # 100 "conditional IE error". When the network receives a message and diagnose a "missing conditional IE" error or an "unexpected conditional IE" error or when it receives a message containing at least one syntactically incorrect conditional IE, the network shall either - try to treat the message (the exact further actions are implementation dependent), or - ignore the message except that it should return a status message (STATUS, MM STATUS, GMM STATUS or SM STATUS depending on the protocol discriminator) with cause # 100 "conditional IE error".