Eucharistic Prayers, changing

From the Forward of Inaestimabile Donum:

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"But these encouraging and positive aspects [of the liturgical reform] cannot suppress concern at the varied and frequent abuses being reported from different parts of the Catholic world: [...] misunderstanding of the ecclesial character of the Liturgy (the use of private texts, the proliferation of unapproved Eucharistic Prayers, the manipulation of the liturgical texts for social and political ends) [....]"

 

A. The Mass, #5:
"Only the Eucharistic Prayers included in the Roman Missal or those that the Apostolic See has by law admitted, in the manner and within the limits laid down by the Holy See, are to be used. To modify the Eucharistic Prayers approved by the Church or to adopt others privately composed is a most serious abuse."

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Redemptionis Sacramentum, par. 51:

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"Only those Eucharistic Prayers are to be used which are found in the Roman Missal or are legitimately approved by the Apostolic See, and according to the manner and the terms set forth by it. “It is not to be tolerated that some Priests take upon themselves the right to compose their own Eucharistic Prayers” or to change the same texts approved by the Church, or to introduce others composed by private individuals."

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For more on abuses of the Eucharistic Prayers, search the documents quoted above and the Roman Missal (see Church Documents).