Those long texts are linked to the ER, you can enter long texts for other objects as well. The Web UI uses /PLMU/WDC_LTX_DO to handle long texts. Going from the SP to the BO you will find out that the standard READ_TEXT and SAVE_TEXT function modules are used. The relevant parameters are TDID = ECRI, TDOBJECT = /PLMB/ECRI and TDNAME = <ECR GUID> + INDEX for the text 001 ... 999.
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