You can insert as many descriptions for an order as you want.
<NLS_PROC_TYPE>
Mandatory.
Processing type.
Allowable values: I, U, and N.
'I' means that the object is to be inserted; 'U' means that an update is to be performed. ‘N’ means that the description is not processed; that is, neither inserted nor modified. ‘N’ is not required for the language-dependent descriptions, only for orders and their line items.
<NLS_ID>
Mandatory.
Allowable values: All languages defined on A.10.01 Languages.
<SHORT_DESC>
Mandatory.
Language-dependent short description for an order.
<DESCRIPTION>
Mandatory.
Language-dependent description for an order.